GENERAL INFORMATION State Emission Standards (2024)

ALASKA

NOTE:Because of frequent revisions in state emission standards, the emission standards listed in this article should only be used as a guide.

NOTE:As of March 1, 2012, Alaska is not testing for tailpipe emissions.

ALASKA EMISSION STANDARDS - ANCHORAGE & FAIRBANKS (2-SPEED IDLE TEST)

ApplicationIdle HC ppm (CO %)2500 RPM HC ppm (CO %)
Passenger Cars (1)
1968-711000 (5.0)1000 (4.0)
1972-741000 (4.0)1000 (3.0)
1975-801000 (2.0)1000 (2.0)
1981-831000 (1.0)1000 (1.0)
1984-93750 (1.0)750 (1.0)
1994-200 (0.5)200 (0.5)
Light & Medium Duty Trucks (1)
1968-721000 (5.0)1000 (4.0)
1973-781000 (4.0)1000 (3.0)
1979-831000 (2.0)1000 (2.0)
1984-93750 (1.0)750 (1.0)
1994-220 (0.5)220 (0.5)
Heavy Duty Vehicles (2)
1968-731000 (5.0)1000 (5.0)
1974-931000 (4.0)1000 (4.0)
1994-220 (1.0)220 (1.0)
(1)8500 GVWR or less.
(2)8500 GVWR or more.

ARIZONA

NOTE:Curb idle only test are for vehicles with full-time 4WD, non-defeatable traction control and motorcycles. Curb idle and loaded cruise tests are performed on 1967-80 light-duty gasoline powered vehicles and all heavy-duty gasoline powered vehicles.

ARIZONA EMISSION STANDARDS - PHOENIX AREA (CURB IDLE & LOADED CRUISE TESTS)

Application (1)Idle HC ppm (CO %)(2) Loaded/Cruise HC ppm (CO %)
Light Duty Vehicles (6000 GVWR Or Less)
1967-71 4-Cyl. Or Less500 (5.50)500 (4.20)
1967-71 More Than 4-Cyl.450 (5.00)450 (3.75)
1972-74 4-Cyl. Or Less400 (5.50)400 (4.20)
1972-74 More Than 4-Cyl.400 (5.00)400 (3.75)
1975-78 4-Cyl. Or Less250 (2.20)250 (1.65)
1975-78 More Than 4-Cyl.250 (2.00)250 (1.50)
Light Duty Vehicles (8500 GVWR Or Less)
1979 4-Cyl. Or Less220 (2.20)220 (1.65)
1979 More Than 4-Cyl.220 (2.20)220 (1.50)
1980220 (1.20)220 (1.20)
1981 & Newer220 (1.20).....
Light Duty Trucks (6000 GVWR Or Less)
1967-80(3)(3)
Light Duty Trucks (6001-8500 GVWR)
1967-74(3)(3)
1975-78350 (4.00)350 (3.00)
1979 4-Cyl. Or Less220 (2.20)220 (1.65)
1979 More Than 4-Cyl.220 (2.00)220 (1.50)
1980220 (1.20)220 (1.20)
1981 & Newer220 (1.20).....
Heavy Duty Trucks (Greater Than 8500 GVWR)
1967-74(3)(3)
1975-78350 (4.00)350 (3.00)
1979 & Newer300 (4.00)300 (3.00)
Motorcycles
1967 & Newer1800 (5.50).....
(1)4-stroke engines only.
(2)Except AWD, non-defeatable traction control and motorcycles.
(3)Same as light duty vehicles.

ARIZONA EMISSION STANDARDS - PHOENIX AREA (IM147 TEST)

ApplicationHC gpm (CO gpm)NOx gpm
Light Duty Vehicles
1981-823.0 (25.0)3.5
1983-852.4 (20.0)3.5
1986-891.6 (15.0)2.5
1990-931.0 (12.0)2.5
1994 & Newer0.8 (12.0)2.0
Light Trucks (6000 GVWR Or Less)
1981-854.0 (40.0)5.5
1986-893.0 (25.0)4.5
1990-932.0 (20.0)4.0
1994 & Newer1.6 (20.0)3.0
Light Duty Trucks (6000-8500 GVWR)
1981-854.4 (48.0)7.0
1986-874.0 (40.0)5.5
1988-893.0 (25.0)5.5
1990-933.0 (25.0)5.0
1994 & Newer2.4 (25.0)4.0

NOTE:Curb idle test only for 1967-80 light-duty gasoline vehicles, all vehicles with full-time 4WD and/or non-defeatable traction control and motorcycles. Curb idle and loaded cruise tests are performed on all 1981 and later vehicles except those with full-time 4WD and/or non-defeatable traction control.

ARIZONA EMISSION STANDARDS - TUCSON AREA (CURB IDLE & LOADED CRUISE TESTS)

Application (1)Idle HC ppm (CO %)(2) Loaded/Cruise HC ppm (CO %)
Light Duty Vehicles (6000 GVWR Or Less)
1967-71 4-Cyl. Or Less500 (5.50).....
1967-71 More Than 4-Cyl.450 (5.00).....
1972-74 4-Cyl. Or Less400 (5.50).....
1972-74 More Than 4-Cyl.400 (5.00).....
1975-78 4-Cyl. Or Less250 (2.20).....
1975-78 More Than 4-Cyl.250 (2.00).....
Light Duty Vehicles (8500 GVWR Or Less)
1979 4-Cyl. Or Less220 (2.20).....
1979 More Than 4-Cyl.220 (2.20).....
1980220 (1.20).....
1981 & Newer220 (1.20)220 (1.20)
Light Duty Trucks (6000 GVWR Or Less)
1967-80(3)(3)
Light Duty Trucks (6001-8500 GVWR)
1967-74(3)(3)
1975-78350 (4.00).....
1979 4-Cyl. Or Less220 (2.20).....
1979 More Than 4-Cyl.220 (2.00).....
1980220 (1.20).....
1981 & Newer220 (1.20)220 (1.20)
Heavy Duty Trucks (Greater Than 8500 GVWR)
1967-74(3)(3)
1975-78350 (4.00).....
1979-80300 (4.00).....
1981 & Newer300 (4.00)300 (3.00)
Motorcycles
1967 & Newer1800 (5.50).....
(1)4-stroke engines only.
(2)Except AWD, non-defeatable traction control and motorcycles.
(3)Same as light duty vehicles.

CALIFORNIA

California Emission Standards ASM Tests

Specific vehicle cutpoints are available on the California BAR web site at www.bar.ca.gov under the Industry tab, then Cutpoints Application.

Fig. 1: California Emission Standards - Enhanced & Partially Enhanced Program Areas - Light & Medium Duty Vehicles (ASM Test)

Fig. 2: California Emission Standards - Enhanced & Partially Enhanced Program Areas - Heavy Duty Vehicles (ASM Test)

Legend

  • ESC - Emission Standard Category
  • GVWR - Manufacture's Gross Vehicle Weight Rating
  • LVW - Loaded Vehicle Weight
  • PC - Passenger Car
  • LDT1 - Light-Duty Truck up through 3750 LVW and GVWR no greater than 6000 lbs.
  • LDT2 - Light-Duty Truck greater than 3750 LVW and GVWR no greater than 6000 lbs.
  • MDV - Medium-Duty Vehicle, GVWR from 6001 to 8500 lbs.
  • HC - Hydrocarbon, ppm
  • CO - Carbon Monoxide, %
  • NO - Nitric Oxide, ppm

Pass/Fail Emission Standards = A+B / VTW

PASS/FAIL STANDARDS - Emission standards used to determine if a vehicle passes the emission inspection. A vehicle passes if the emission levels are equal to or less than the standards for HC, CO and NO for ASM 5015 and ASM 2525.

GROSS POLLUTER STANDARDS - Emission standards used to designate a vehicle as a gross polluter. A vehicle is designated as a gross polluter if the emission levels at the time of the initial inspection, before repairs are greater than the gross polluter standards for HC, CO or NO for ASM 5015 or ASM 2525.

NOTE:If test data on emission pass/fail rates or gross polluter identification rates indicate adjustments are required, the emission standards may be increased or decreased by the bureau by 30% or by the following tolerances, or standards may be set for any specific vehicle and engine configuration which the bureau determines has excessive errors of commission of omission, whichever is necessary to comply with Section 44001.5 of the Health and Safety Code.

COLORADO

COLORADO EMISSION STANDARDS - ENHANCED PROGRAM (IM240)

ApplicationHC gpmCO gpmNOx gpm
Passenger Cars
19823.5455.0
19833.5304.5
19843.0304.5
19852.5204.5
19862.5204.5
19872.5204.0
1988 & 19892.0204.0
19902.0203.5
19911.5203.5
19921.5153.5
19931.5153.5
19941.2153.0
19951.2152.5
19961.2152.0
19971.2152.0
1998 & Newer1.2151.5
Light Duty Vehicles
19826.0656.0
19836.0656.0
19845.0556.0
19854.5456.0
19864.0406.0
19873.5305.5
1988 & 19893.0255.0
19903.0255.0
19912.5254.5
19922.5254.5
19932.5254.5
19942.0204.0
19952.0204.0
19961.2153.5
19971.2153.0
19981.2152.0
1999 & Newer1.2152.0

COLORADO EMISSION STANDARDS - 2-SPEED IDLE TEST

ApplicationHC ppmCO %
Passenger Cars & Light Duty Trucks
1970 & Earlier10003.5
197110003.0
197210003.0
197310003.0
197410003.0
19756002.0
19766002.0
19774001.5
19784001.5
19794001.5
19804001.5
1981 & Newer2201.2
Heavy Duty Trucks (6000 GVWR Or Greater)
1967 Or Earlier15007.0
1968-6912006.5
196912006.5
197010005.5
197110005.5
197210005.5
197310005.5
197410005.5
197510005.5
197610005.5
197710005.5
197810005.5
Heavy Duty Trucks (8501 GVWR Or Greater)
19798004.0
19808003.5
19816003.0
19826003.0
19836003.0
19846003.0
19856003.0
1986 & Newer3002.0

CONNECTICUT

CONNECTICUT EMISSION STANDARDS - IDLE TEST

ApplicationHC ppm (CO)
10,000 GVWR Or Less
1979250 (2.1)
1980225 (2.0)
1981-82200 (1.2)
1983175 (1.0)
1984-87150 (1.0)
1988 & Newer125 (1.0)

DELAWARE

DELAWARE EMISSION STANDARDS - KENT, NEW CASTLE & SUSSEX COUNTIES (IDLE TEST)

ApplicationHC ppm (CO %)
Light Duty Vehicles (6000 GVWR Or Less)
1968-70900 (9.0)
1971-74600 (6.0)
1975-79400 (4.0)
1980220 (2.0)
1981 & Newer220 (1.2)
Light Duty Trucks (6001-8500 GVWR)
1970-72900 (9.0)
1973-78600 (6.0)
1979-83400 (4.0)
1984 & Newer220 (1.2)

DISTRICT OF COLUMBIA

DISTRICT OF COLUMBIA EMISSION STANDARDS - IDLE TEST

ApplicationHC ppm (CO %)
Light Duty Vehicles & Trucks (26000 GVWR Or Less)
1968-701250 (11.0)
1971-741200 (9.0)
1975-79600 (6.5)
1980300 (1.5)
1981 & Newer220 (1.2)

GEORGIA

NOTE:The Georgia program incorporates original U.S. EPA recommended start-up ASM2525 and ASM5015 standards for 1995 and older model year vehicles. Refer to appropriate model year range in appropriate table. See .

GEORGIA EMISSION STANDARDS - 2-SPEED IDLE TEST

Application (1)HC ppm (CO %)
1979500 (5.0)
1980350 (3.5)
1981-83250 (1.5)
1984 & Newer220 (1.2)
(1)8500 GVWR or less.

IDAHO

IDAHO EMISSION STANDARDS - 2-SPEED IDLE TEST

ApplicationHC ppm (CO %)
Light Duty Vehicles
8500 GVWR Or Less
1965-74900 (5.0)
1975-79700 (3.0)
1980400 (1.5)
1981 & Newer220 (1.2)
Heavy Duty Trucks
8501 GVWR Or More
1965-74900 (6.0)
1975-80700 (5.0)
1981 & Newer500 (3.0)

ILLINOIS

ILLINOIS EMISSION STANDARDS - IM240 TEST

ApplicationHC gpmCO gpm
Light Duty Vehicles (6000 GVWR Or Less)
1981-822.0060.0
1983-872.0030.0
1988-950.8015.0
1996 & Newer0.6010.0
Light Duty Trucks (6000 GVWR Or Less)
1981-837.50100.0
1984-873.2080.0
1988-951.6040.0
1996 & Newer (3750 LVW Or More) (1)0.8013.0
1996 & Newer (3750 LVW Or Less) (1)0.6010.0
Light Duty Trucks (6001-6500 GVWR)
1981-837.50100.0
1984-873.2080.0
1988-951.6040.0
1996 & Newer (5750 ALVW Or More)0.8015.0
1996 & Newer (5750 ALVW Or Less)0.8013.0
(1)Loaded Vehicle Weight (LVW) is vehicle curb weight plus 300 lbs.

ILLINOIS EMISSION STANDARDS - IDLE TEST

ApplicationHC ppm (CO %)
Passenger Vehicles (6000 GVWR Or Less)
1968-71900 (9.0)
1972-74800 (8.0)
1975-77700 (7.0)
1978-79600 (6.0)
1980300 (3.0)
1981 & Newer220 (1.2)
Light Duty Vehicles (8000 GVWR Or Less)
1968-71900 (9.0)
1972-74800 (8.0)
1975-78700 (7.0)
1979-80600 (6.0)
1981-83300 (3.0)
1984 & Newer220 (1.2)
Heavy Duty Vehicles (8001 GVWR Or More)
1968-711500 (9.5)
1972-78900 (9.0)
1979-84700 (7.0)
1985 & Newer300 (3.0)

INDIANA

INDIANA EMISSION STANDARDS - IM93 TEST

ApplicationHC gpm (CO gpm)NOx (gpm)
Passenger Cars
1981-822.0 (60)3.0
1983-862.0 (30)3.0
1987-901.4 (20)3.0
1991-950.8 (15)2.5
1996 & Newer0.6 (10)2.5
Light Duty Trucks (6000 GVWR Or Less)
1981-835.0 (80)7.0
1984-863.2 (70)7.0
1987-902.2 (55)3.5
1991-951.6 (40)3.0
1996 & Newer0.8 (20)3.0
Light Duty Trucks (6001-8500 GVWR)
1981-835.0 (80)7.0
1984-863.2 (70)7.0
1987-902.2 (55)5.0
1991-961.6 (40)4.5
1997 & Newer0.8 (20)4.5
Heavy Duty Trucks (8501-9000 GVWR)
1981-827.5 (100)8.0
1983-846.0 (100)8.0
1985-865.0 (75)8.0
1987-903.0 (60)8.0
1991-972.4 (40)8.0
1998 & Newer2.0 (30)6.0

INDIANA EMISSION STANDARDS - IDLE TEST

ApplicationHC ppm (CO %)
Passenger Cars
1976-79350 (3.5)
1980250 (2.0)
1981 & Newer220 (1.2)
Light Duty Trucks (6000 GVWR Or Less)
1976-78500 (5.0)
1979-83350 (3.5)
1984 & Newer220 (1.2)
Medium Duty Trucks (6001-8500 GVWR)
1976-78500 (5.0)
1979-83350 (3.5)
1984 & Newer220 (1.2)

KENTUCKY

NOTE:Currently, there is no emission testing in Kentucky.

KENTUCKY EMISSION STANDARDS - BOONE, CAMPBELL & KENTON COUNTIES (IDLE TEST)

ApplicationHC ppm (CO)
Passenger Cars (Automobiles)
1968950 (8.5)
1969900 (8.5)
1970850 (8.1)
1972800 (8.0)
1973800 (7.8)
1974800 (7.6)
1975700 (7.5)
1976700 (6.5)
1977650 (6.3)
1978600 (5.5)
1979600 (4.5)
1980250 (2.5)
1981 & Newer220 (1.2)
Light Duty Trucks (6000 GVWR Or Less)
19681300 (8.0)
19691200 (8.0)
1970-711100 (8.0)
1972-731000 (7.8)
1974950 (7.8)
1975900 (7.0)
1976-77700 (7.0)
1978700 (6.3)
1979450 (5.5)
1980450 (4.0)
1981350 (1.7)
1982 & Newer220 (1.2)
Light Duty Trucks (6001-10,000 GVWR)
19691500 (9.0)
19701100 (8.0)
19711000 (8.0)
1972-75950 (7.5)
1976900 (7.5)
1977850 (7.5)
1978700 (6.0)
1979650 (5.5)
1980550 (5.0)
1981450 (4.0)
1982400 (2.5)
1983350 (2.0)
1984220 (1.5)
1985 & Newer220 (1.2)
Heavy Duty Trucks (10,001-18,000 GVWR)
19681500 (9.0)
1969-701300 (8.5)
19711200 (8.5)
1972-761000 (7.0)
1977-80900 (6.5)
1982-83400 (3.0)
1984 & Newer250 (1.5)

MARYLAND

MARYLAND EMISSION STANDARDS - IM240 TEST

ApplicationHC gpm (CO gpm)NOx gpm
Light Duty Vehicles (6000 GVWR Or Less)
1984-871.80 (30.0)2.8
1988-901.40 (30.0)2.5
1991-931.00 (20.0)2.2
1994-950.90 (20.0)2.1
Light Duty Trucks (6000 GVWR Or Less)
1984-872.80 (80.0)5.8
1988-902.40 (80.0)3.0
1991-932.00 (60.0)2.7
1994-951.80 (60.0)2.6
Light Duty Trucks (6001-8500 GVWR)
1984-872.90 (80.0)6.6
1988-902.40 (80.0)4.2
1991-932.00 (60.0)4.0
1994-951.80 (60.0)3.7
Heavy Duty Trucks (8501-9999 GVWR)
19845.80 (100.0)7.7
1985-864.70 (80.0)7.7
19873.00 (80.0)7.7
1988-902.60 (80.0)7.0
1991-972.50 (60.0)5.5
1998 & Newer2.20 (60.0)4.0

MARYLAND EMISSION STANDARDS - IDLE TEST

ApplicationHC ppm (CO %)
Light Duty Vehicles (6000 GVWR Or Less)
1977500 (6.0)
1978430 (5.5)
1979400 (4.0)
1980220 (1.7)
1981 & Newer220 (1.2)
Light Duty Trucks (6001-9999 GVWR)
1977580 (7.0)
1978550 (6.7)
1979470 (5.0)
1980350 (5.0)
1981250 (3.0)
1982220 (2.5)
1983220 (1.5)
1984 & Newer220 (1.2)
Heavy Duty Trucks (10,000-26,000 GVWR)
1977-78650 (7.0)
1979650 (6.5)
1980-82500 (6.0)
1983500 (3.5)
1984-85440 (3.0)
1986280 (2.5)
1987 & Newer220 (1.2)

MASSACHUSETTS

MASSACHUSETTS EMISSION STANDARDS - MA31 TEST

ApplicationHC gpm (CO gpm)NOx gpm
Passenger Cars
1984-902.0 (30)3.0
1991-951.2 (20)2.5
1996 & Newer0.8 (13)2.0
Light Duty Trucks (6000 GVWR Or Less)
1984-873.2 (80)7.0
1988-19903.2 (80)3.5
1991-952.4 (60)3.0
1996 & Newer (3750 LVW (1) Or Less)0.8 (15)2.0
1996 & Newer (3751 LVW (1) Or Greater)1.0 (20)2.5
Light Duty Trucks (6001-8500 GVWR)
1984-873.2 (80)7.0
1988-903.2 (80)5.0
1991-952.4 (60)4.5
1996 & Newer (5750 ALVW (2) Or Less)1.0 (20)2.5
1996 & Newer (5751 ALVW (2) Or Greater)2.4 (60)4.0
Heavy Duty Trucks (8501-10,000 Or Greater)
1984-873.2 (80)7.0
1988-903.2 (80)5.0
1991-952.4 (60)4.5
1996 & Newer2.4 (60)4.0
(1)Loaded Vehicle Weight (LVW).
(2)Adjusted Loaded Vehicle Weight (ALVW).

MASSACHUSETTS EMISSION STANDARDS - 2-SPEED IDLE TEST

ApplicationHC ppm (CO %)
All Vehicles
1984-86220 (0.80)
1987 & Newer100 (0.60)

MISSOURI

MISSOURI EMISSION STANDARDS - JEFFERSON, ST. CHARLES & ST. LOUIS COUNTIES - IM240 TEST

ApplicationHC gpm (CO gpm)NOx gpm
Light Duty Vehicles (6000 GVWR Or Less)
1981-820.80 (30.0)2.0
1983-950.80 (15.0)2.0
1996 & Newer0.60 (10.0)1.5
Light Duty Trucks (6000 GVWR Or Less)
1981-833.40 (70.0)4.5
1984-871.60 (40.0)4.5
1988-951.60 (40.0)2.5
1996 & Newer (Less Than 3750 LVW)0.80 (13.0)1.8
1996 & Newer (3750 LVW Or Less)0.60 (10.0)1.5
Light Duty Trucks (6001-8500 GVWR)
1981-833.4 (70.0)4.5
1984-871.6 (40.0)4.5
1988-951.60 (40.0)3.5
1996 & Newer (5750 ALVW Or Less)0.80 (13.0)1.8
1996 & Newer (5750 ALVW Or More)0.80 (15.0)2.0

MISSOURI EMISSION STANDARDS - FRANKLIN, JEFFERSON, ST. CHARLES & ST. LOUIS COUNTIES - IDLE TEST

Application (1)HC ppm (CO %)
1971-74700 (7.0)
1975-79600 (6.0)
1980300 (3.0)
1981 & Newer220 (1.2)
(1)8500 GVWR or less.

MISSOURI EMISSION STANDARDS - FRANKLIN, JEFFERSON, ST. CHARLES & ST. LOUIS COUNTIES - REMOTE SENSING CLEAN SCREEN TEST

Application (1)HC ppm (CO %)NOx ppm
All Vehicles (8500 GVWR Or Less)
1971 & Newer200 (0.5)2000
(1)8500 GVWR or less.

NEVADA

NEVADA EMISSION STANDARDS - 2-SPEED IDLE TEST

ApplicationHC ppm (CO %)
Light Duty Vehicles (8500 GVWR Or Less)
1968-69800 (4.0)
1970-74700 (3.5)
1975-78500 (2.5)
1979-80500 (2.0)
1981 & Newer220 (1.2)
Heavy Duty Vehicles (8501 GVWR Or More)
1968-691400 (7.0)
1970-781400 (6.0)
19791000 (5.0)
19801000 (4.0)
1981 & Newer1000 (3.5)

NEW JERSEY

NOTE:The New Jersey program incorporates original U.S. EPA recommended start-up ASM5015 standards for 1981 and newer model year vehicles. Refer to appropriate model year range in appropriate table. See .

NEW JERSEY EMISSION STANDARDS - 2-SPEED IDLE TEST

ApplicationIdle HC ppm (CO %)2500 RPM HC ppm (CO %)
Light Duty Vehicles (8500 GVWR Or Less)
1967 & Earlier1400 (8.5).....
1968-70700 (7.0).....
1971-74500 (5.0).....
1975-80300 (3.0).....
1981 & Newer220 (1.2)100 (0.5)
Heavy Duty Vehicles (8501 GVWR Or Greater)
1967 & Earlier1400 (8.5).....
1968-701200 (8.5).....
1971-74700 (6.0).....
1975-78500 (4.0).....
1979 & Earlier300 (3.0).....

NEW MEXICO

NEW MEXICO EMISSION STANDARDS - 2-SPEED IDLE TEST

ApplicationIdle HC ppm (CO %)2500 RPM HC ppm (CO %)
Light Duty Vehicles (6000 GVWR Or Less)
1975-78500 (5.0)500 (5.0)
1979-80400 (4.0)400 (4.0)
1981-85220 (1.2)220 (1.2)
1986-90200 (1.2)200 (1.2)
1991-95180 (1.2)180 (1.2)
Light Duty Trucks (6001-8000 GVWR)
1975-78600 (6.0)600 (6.0)
1979-80600 (4.5)600 (4.5)
1981-82400 (2.7)400 (3.0)
1983-88300 (1.2)300 (3.0)
1989-95220 (1.2)220 (1.2)
Medium Duty Trucks (8001-10,000 GVWR)
1975 & Newer650 (6.5)650 (6.5)

NEW YORK

NEW YORK EMISSION STANDARDS - IM240 TEST

ApplicationHC gpm
Composite
HC gpm
Phase 2
CO gpm
Composite
CO gpm
Phase 2
NOx gpm
Both
Light Duty Vehicles
1981-820.800.5030.024.02.0
1983-950.800.5015.012.02.0
1996 & Newer0.600.4010.08.01.5
Light Duty Trucks (6000 GVWR Or Less)
1981-833.402.0070.056.04.5
1984-871.601.0040.032.04.5
1988-951.601.0040.032.02.5
1996 & Newer (3750 LVW Or Less)0.600.4010.08.01.5
1996 & Newer (3751 LVW Or More)0.800.5013.010.01.8
Light Duty Trucks (6501-8500 GVWR)
1981-833.402.0070.056.04.5
1984-871.601.0040.032.04.5
1988-951.601.0040.032.03.5
1996 & Newer (5750 ALVW Or Less)0.800.5013.010.01.8
1996 & Newer (5751 ALVW Or More)0.800.5015.012.02.0

NEW YORK EMISSION STANDARDS - IDLE TEST

ApplicationHC ppm (CO %)
Light Duty Vehicles (8500 GVWR Or Less)
1978300 (3.0)
1979-80300 (2.5)
1981 & Newer220 (1.2)
Heavy Duty Vehicles (8501 GVWR Or More)
1978600 (4.5)
1979 & Newer300 (3.0)

NORTH CAROLINA

NORTH CAROLINA EMISSION STANDARDS - IDLE TEST

ApplicationHC ppm (CO %)
Light Duty Vehicles (8500 GVWR Or Less)
1977450 (4.5)
1978-79350 (3.5)
1980250 (2.0)
1981 & Newer250 (1.2)
Heavy Duty Trucks (8501 GVWR Or More)
1977-78500 (5.0)
1979 & Newer400 (4.0)

OHIO

NOTE:The Ohio program incorporates original U.S. EPA recommended start-up ASM2525 standards for all model year vehicles. Refer to appropriate model year range in appropriate table. See .

OHIO EMISSION STANDARDS - 2-SPEED IDLE TEST

ApplicationHC ppm (CO %)
1978350 (4.0)
1979275 (3.0)
1980230 (2.0)
1981 & Newer220 (1.2)

OREGON

OREGON EMISSION STANDARDS - METROPOLITAN PORTLAND ENHANCED AREA - BAR31

ApplicationHC gpm (CO gpm)NOx gpm
Light Duty Passenger Cars
1981-822.0 (64)3.70
1983-892.0 (32)3.70
1990-951.2 (30)3.00
1996 & NewerOBD-II TestOBD-II Test
Light Duty Trucks (6000 GVWR Or Less)
1981-838.5 (149)8.32
1984-874.0 (85)8.32
1988-894.0 (85)4.62
1990-952.4 (80)3.75
1996 & NewerOBD-II TestOBD-II Test
Light Duty Trucks (6001-8500 GVWR)
1981-838.5 (149)8.32
1984-874.0 (85)8.32
1988-894.0 (85)6.47
1990-952.4 (80)5.25
1996 & NewerOBD-II TestOBD-II Test

OREGON EMISSION STANDARDS - METROPOLITAN PORTLAND & ROGUE VALLEY AREA BASIC TEST - 2-SPEED IDLE TEST

ApplicationIdle HC ppm (CO %)2500 RPM HC ppm (CO %)
Light Duty Passenger Cars (6000 GVWR Or Less)
1975-80 (No Catalyst)300 (2.5)-
1975-80 (Catalyst)220 (1.0)-
1981 & Newer (All)220 (1.0)220 (1.0)
1975 & Newer (2-Stroke)n/a (7.0)-
Light Duty Trucks (6001-8500 GVWR)
1975-78 (All)350 (2.5)-
1979-80 (No Catalyst)300 (2.5)-
1979-80 (Catalyst)220 (1.0)-
1981 & Newer (All)220 (1.0)220 (1.0)
1996 & Newer (3750 LVW Or Less)0.9 (20)2.25
Heavy Duty Trucks (8501 GVWR Or More)
1975-78 (Carbureted)500 (4.0)n/a (3.0)
1975-78 (Fuel Injection)500 (4.0)-
1979-84 (Carbureted)350 (3.0)n/a (3.0)
1979-84 (Fuel Injection)350 (3.0)-
1985 & Newer (No Catalyst)350 (3.0)n/a (3.0)
1985 & Newer (W/Catalyst)220 (1.0)220 (1.0)

OREGON EMISSION STANDARDS - METROPOLITAN PORTLAND & ROGUE VALLEY AREA BASIC TEST - EXHAUST OPACITY TEST

ApplicationOpacity % @ IdleOpacity % @ High Idle
1975 & Newer
2-Cycle Engines20.....
Gasoline Engines00

PENNSYLVANIA

NOTE:The Pennsylvania (in Philadelphia area) program incorporates original U.S. EPA recommended start-up ASM5015 standards for 1981 and newer model year vehicles. Refer to appropriate model year range in appropriate table. See .

PENNSYLVANIA EMISSION STANDARDS - PITTSBURGH & OLDER PHILADELPHIA VEHICLES - IDLE TEST

ApplicationHC ppm (CO %)
6000 GVWR Or Less
1975-79400 (4.0)
1980300 (3.0)
1981-92220 (1.2)
1993 & Newer130 (1.0)
6001-9000 GVWR
1975-78650 (6.0)
1979400 (4.0)
1980300 (3.0)
1981-92220 (1.2)
1993 & Newer180 (1.0)

RHODE ISLAND

RHODE ISLAND EMISSION STANDARDS - RI2000 TEST

ApplicationHC gpm (CO gpm)NOx gpm
Light Duty Vehicles
1974 & Earlier15.92 (132.44)14.92
1975-766.74 (96.21)9.92
1977-796.74 (96.21)6.59
19802.25 (45.48)6.59
1981-822.25 (45.48)3.25
1983-952.25 (23.74)3.25
1996 & Newer1.84 (16.50)2.42
Light Duty Trucks (6000 GVWR Or Less)
1975 & Earlier16.94 (175.92)14.92
1975-788.78 (117.95)9.92
1979-837.55 (103.45)7.42
1984-873.88 (59.97)7.42
1988-903.88 (59.97)4.09
1991-953.88 (59.97)4.09
1996 & Newer (3750 LVW Or Less)1.84 (16.50)2.42
1996 & Newer (3751 LVW Or More)2.25 (20.84)2.92
Light Duty Trucks (6001-8500 GVWR)
1974 & Earlier16.94 (175.92)14.92
1975-788.78 (117.95)9.92
1979-837.55 (103.45)7.42
1984-873.88 (59.97)7.42
1989-903.88 (59.97)5.75
1991-953.88 (59.97)5.75
1996 & Newer (5750 LVW Or Less)2.25 (20.84)2.92
1996 & Newer (5751 LVW or More)5.51 (23.74)3.25

RHODE ISLAND EMISSION STANDARDS - 2-SPEED IDLE TEST

Application Idle (1)HC ppm (CO %)
1967 & Earlier800 (7.0)
1968-74700 (6.0)
1975-78300 (3.0)
1979-80300 (2.5)
1981 & Newer220 (1.2)
(1)8500 GVWR or less.

TENNESSEE

TENNESSEE EMISSION STANDARDS - MEMPHIS - IDLE TEST

ApplicationHC ppm (CO %)
Light Duty Vehicles (9000 GVWR Or Less)
1971 & Older900 (8.9)
1972-74700 (8.2)
1975-79600 (7.5)
1980400 (4.7)
1981 & Newer220 (1.2)
Heavy Duty Trucks (9001-25,999 GVWR)
1971 & Older1000 (8.9)
1972-741000 (8.2)
1975-791000 (8.0)
1980800 (6.0)
1981 & Newer400 (4.0)

TENNESSEE EMISSION STANDARDS - DAVIDSON & NASHVILLE COUNTIES - IDLE TEST

ApplicationHC ppm (CO %)
Light Duty Vehicles (6000 GVWR Or Less)
1975-77500 (5.0)
1978-79400 (4.0)
1980300 (3.0)
1981 & Newer220 (1.2)
Medium Duty Trucks (6001-8500 GVWR)
1975-77750 (6.5)
1978-79600 (6.0)
1980400 (4.5)
1981 & Newer400 (4.0)

TENNESSEE EMISSION STANDARDS - FOUR COUNTY AREA SURROUNDING NASHVILLE - IDLE TEST

ApplicationHC ppm (CO %)
Light Duty Vehicles (6000 GVWR Or Less)
1975-77500 (5.0)
1978-79400 (4.0)
1980300 (3.0)
1981 & Newer220 (1.2)
Medium Duty Trucks (6001-8500 GVWR)
1975-77750 (6.5)
1978-79600 (6.0)
1980400 (4.5)
1981 & Newer400 (4.0)

TEXAS

NOTE:The Texas program incorporates original U.S. EPA recommended start-up ASM2525 and ASM5015 standards for 1995 and newer model year vehicles. Refer to appropriate model year range in appropriate table. See .

TEXAS EMISSION STANDARDS - 2-SPEED IDLE TEST

ApplicationHC ppm (CO %)
Light Duty Vehicles (8500 GVWR Or Less)
1979600 (6.0)
1980400 (4.0)
1981 & Newer220 (1.2)
Heavy Duty Vehicles (8501 GVWR Or More)
1979-81700 (7.0)
1982-84500 (5.0)
1985 & Newer300 (3.0)

UTAH

UTAH EMISSION STANDARDS - DAVIS COUNTY - DC98 TEST

ApplicationHC gpm (CO gpm)NOx gpm
Light Duty Vehicles (6000 GVWR Or Less)
1989-902.00 (30)3.0
1991-951.2 (20)2.5
Light Duty Trucks (6000 GVWR Or Less)
1989-903.2 (80)3.5
1991-952.4 (60)3.0
Light Duty Trucks (6001-8500 GVWR)
1989-903.2 (80)5.0
1991-952.4 (60)4.5

UTAH EMISSION STANDARDS - DAVIS COUNTY - 2-SPEED IDLE TEST

ApplicationHC ppm (CO %)
Light Duty Vehicles (6000 GVWR Or Less)
1968-69800 (6.0)
1970-74700 (5.0)
1975-76600 (4.0)
1977-79500 (3.0)
1980300 (2.0)
1981-95220 (1.2)
Light Duty Vehicles (6001-8500 GVWR)
1968-691500 (7.0)
1970-781200 (5.0)
1979500 (3.0)
1980300 (2.0)
1981-95220 (1.2)
Heavy Duty Vehicles (8501 GVWR Or More)
1968-691500 (7.0)
1970-781200 (5.0)
1979-801000 (4.0)
1981 & Newer800 (3.5)

NOTE:The Salt Lake County program incorporates California style ASM2525 and ASM5015 standards for 1968 and newer model year vehicles; however, actual cutpoints are unique to this program and current information is not available at this time.

UTAH EMISSION STANDARDS - SALT LAKE COUNTY - 2-SPEED IDLE TEST

ApplicationHC ppm (CO %)
Light Duty Vehicles (6000 GVWR Or Less)
1968-69800 (6.0)
1970-74700 (5.0)
1975-76600 (4.0)
1977-79500 (3.0)
1980300 (2.0)
1981 & Newer220 (1.2)
Light Duty Trucks (6000 GVWR Or Less)
1968-99800 (6.0)
1970-74700 (5.0)
1975-76600 (4.0)
1977-79500 (3.0)
1980300 (2.0)
1981 & Newer220 (1.2)
Light Duty Trucks (6001-8500 GVWR)
1968-691500 (7.0)
1970-781200 (5.0)
1979500 (3.0)
1980300 (2.0)
1981 & Newer220 (1.2)
Heavy Duty Trucks (8500 GVWR Or More)
1968-691500 (7.0)
1970-781200 (5.0)
1979-801000 (4.0)
1981 & Newer800 (3.5)

UTAH EMISSION STANDARDS - UTAH & WEBER COUNTIES - 2-SPEED IDLE TEST

ApplicationHC ppm (CO %)
Light Duty Vehicles (6000 GVWR Or Less)
1968-69800 (6.0)
1970-74700 (5.0)
1975-76600 (4.0)
1977-79500 (3.0)
1980300 (2.0)
1981-95220 (1.2)
Light Duty Trucks (6000 GVWR Or Less)
1968-99800 (6.0)
1970-74700 (5.0)
1975-76600 (4.0)
1977-79500 (3.0)
1980300 (2.0)
1981 & Newer220 (1.2)
Light Duty Trucks (6001-8500 GVWR)
1968-691500 (7.0)
1970-781200 (5.0)
1979500 (3.0)
1980300 (2.0)
1981 & Newer220 (1.2)
Heavy Duty Trucks (8500 GVWR Or More)
1968-691500 (7.0)
1970-781200 (5.0)
1979-801000 (4.0)
1981 & Newer800 (3.5)

VIRGINIA

NOTE:The Virginia program incorporates original U.S. EPA recommended start-up ASM2525 and ASM5015 standards for 1981 and newer model year vehicles. Refer to appropriate model year range in appropriate table. See .

VIRGINIA EMISSION STANDARDS - 2-SPEED IDLE TEST

ApplicationHC ppm (CO %)
8500 GVWR Or Less
1975-90400 (4.0)
1980220 (2.0)
1981-89220 (1.2)
1990-95125 (1.0)
1996 & Newer100 (0.75)
8501-10,000 GVWR
1975-79400 (4.0)
1980220 (2.0)
1981-90220 (1.2)
1991-96150 (1.0)
1997 & Newer125 (0.75)

WASHINGTON

WASHINGTON EMISSION STANDARDS - ASM2525 TEST

ApplicationHC ppm (CO %)
1980 & Earlier (Light-Duty Vehicles)
1750 GVWR400 (4.2)
1875 GVWR380 (4.0)
2000 GVWR350 (3.8)
2125 GVWR340 (3.6)
2250 GVWR320 (3.4)
2375 GVWR300 (3.2)
2500 GVWR290 (3.0)
2625 GVWR270 (2.9)
2750 GVWR260 (2.8)
2875 GVWR250 (2.7)
3000 GVWR240 (2.6)
3125 GVWR230 (2.5)
3250 GVWR220 (2.4)
3375 GVWR220 (2.3)
3500 GVWR210 (2.2)
3625 GVWR200 (2.1)
3750 Or Greater GVWR (Passenger Cars Only)200 (2.1)
3750 Or Greater GVWR (Light Duty Trucks)300 (2.5)
1981 & Newer (Light-Duty Vehicles)
1750 GVWR250 (1.8)
1875 GVWR240 (1.7)
2000 GVWR220 (1.6)
2125 GVWR210 (1.5)
2250 GVWR200 (1.5)
2375 GVWR190 (1.4)
2500 GVWR180 (1.3)
2625 GVWR180 (1.3)
2750 GVWR171 (1.2)
2875 GVWR160 (1.2)
3000 GVWR160 (1.1)
3125 GVWR150 (1.1)
3250 GVWR150 (1.0)
3375 GVWR150 (1.0)
3500 GVWR150 (1.0)
3625 GVWR150 (1.0)
3750 Or Greater GVWR (Passenger Cars Only)150 (1.0)
3750 Or Greater GVWR (Light Duty Trucks)300 (2.5)

WASHINGTON EMISSION STANDARDS - 2-SPEED IDLE TEST

ApplicationIdle/2500 RPM HC ppm (CO %)
Light Duty Vehicles (8500 GVWR Or Less)
1980 & Earlier600 (3.0)
1981 & Newer220 (1.2)
Heavy Duty Trucks (8500 GVWR Or More)
1981 & Newer400 (3.0)

WISCONSIN

WISCONSIN EMISSION STANDARDS - IM240 TEST

ApplicationHC gpm (CO gpm)NOx gpm
Light Duty Vehicles (6000 GVWR Or Less)
1968-727.0 (120)7.0
1973-747.0 (120)6.0
1975-763.0 (65)6.0
1977-793.0 (65)4.0
19802.0 (60)4.0
1981-822.0 (60)3.0
1983-862.0 (30)3.0
1987-930.8 (15)2.0
1991-950.8 (15)2.0
1996 & Newer0.6 (10)1.5
Light Duty Trucks (6000 GVWR Or Less)
1968-727.0 (120)7.0
1973-747.0 (120)6.0
1975-784.0 (80)6.0
1979-833.4 (70)4.5
1984-863.2 (70)4.5
19871.6 (40)4.5
1988-951.6 (40)2.5
1996 & Newer (3750 LVW Or Less)0.6 (10)1.5
1996 & Newer (3751 LVW Or More)0.8 (13)1.8
Light Duty Trucks (6001-8500 GVWR)
1968-727.0 (120)7.0
1973-747.0 (120)6.0
1975-784.0 (80)6.0
1979-833.4 (70)4.5
1984-863.2 (70)4.5
1988-961.6 (40)3.5
1997 & Newer (5750 ALVW Or Less)0.8 (13)1.8
1997 & Newer (5751 ALVW Or More)0.8 (15)2.0
Heavy Duty Trucks (8501-10,000 GVWR)
1968-6920.0 (200)15.0
1970-7310.0 (175)10.0
1974-7810.0 (150)10.0
1979-847.5 (100)8.0
1985-865.0 (80)8.0
1987-902.0 (40)6.0
1991-972.0 (40)5.0
1998 & Newer2.0 (30)4.0
Heavy Duty Trucks (10,001 GVWR or More)
1968-6924.0 (250)30.0
1970-7313.0 (175)20.0
1974-7813.0 (150)20.0
1979-8411.5 (150)16.0
1985-8610.0 (150)16.0
1987-903.5 (70)11.0
1991-973.5 (70)9.0
1998 & Newer3.5 (60)7.0

WISCONSIN EMISSION STANDARDS - 2-SPEED IDLE TEST

ApplicationHC ppm (CO %)
Passenger Cars
1968-71800 (8.0)
1972-74550 (7.0)
1975-77450 (5.5)
1978350 (4.0)
1979275 (3.0)
1980230 (2.0)
1981 & Newer220 (1.2)
Light Duty Trucks (6000 GVWR Or Less)
1968-71800 (8.0)
1972-74700 (7.0)
1975-77500 (6.0)
1978450 (5.0)
1979300 (3.0)
1980275 (2.5)
1981-84250 (2.0)
1985 & Newer220 (1.2)
Light Duty Trucks (6001-8500 GVWR)
1968-691450 (9.0)
1970-71800 (8.0)
1972-74700 (7.0)
1975-77550 (6.5)
1978450 (5.5)
1979300 (3.0)
1980275 (2.5)
1981-84250 (2.0)
1985 & Newer220 (1.2)
Heavy Duty Trucks (8501 GVWR Or More)
1968-711500 (9.5)
1972-78900 (9.0)
1979-84700 (7.0)
1985 & Newer300 (3.0)

U. S. EPA ASM2525 & ASM5015 START-UP EMISSION STANDARDS

U.S. EPA ASM EMISSION STANDARDS - 1968-72 LIGHT DUTY VEHICLES

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
17501118 (8.02)49901098 (9.90)4990
18751052 (7.56)49901034 (9.90)4990
2000992 (7.14)4990975 (9.90)4990
2125938 (6.75)4990921 (9.66)4990
2250887 (6.40)4990872 (9.14)4990
2375841 (6.07)4990827 (8.67)4990
2500800 (5.78)4990786 (8.25)4990
2625761 (5.51)4990748 (7.85)4990
2750726 (5.26)4990714 (7.50)4772
2875695 (5.03)4892683 (7.17)4556
3000666 (4.83)4680654 (6.87)4359
3125639 (4.64)4488628 (6.60)4180
3250615 (4.47)4311604 (6.35)4016
3375593 (4.31)4150583 (6.13)3866
3500573 (4.17)4002563 (5.92)3728
3625554 (4.04)3867544 (5.73)3602
3750537 (3.91)3741527 (5.55)3485
3875521 (3.80)3625512 (5.39)3377
4000506 (3.70)3517497 (5.24)3276
4125492 (3.60)3416484 (5.09)3182
4250479 (3.51)3321471 (4.96)3094
4375467 (3.42)3230459 (4.83)3010
4500455 (3.34)3145447 (4.71)2930
4625444 (3.26)3063436 (4.60)2854
4750433 (3.18)2983425 (4.49)2780
4875423 (3.11)2907415 (4.38)2709
5000412 (3.03)2833405 (4.28)2540
5125402 (2.97)2760395 (4.18)2573
5250393 (2.90)2690386 (4.08)2507
5375383 (2.83)2621376 (3.98)2443
5500374 (2.77)2554367 (3.89)2381
5625365 (2.70)2489359 (3.80)2321
5750357 (2.64)2426350 (3.71)2262
5875348 (2.59)2366342 (3.62)2206
6000341 (2.53)2308334 (3.54)2152
6125333 (2.48)2254327 (3.47)2102
6250326 (2.43)2204320 (3.40)2056
6375320 (2.39)2159314 (3.34)2014
6500315 (2.35)2119309 (3.28)1977
6625310 (2.32)2087304 (3.23)1947
6750307 (2.29)2062301 (3.20)1924
6875305 (2.28)2046299 (3.17)1909
7000304 (2.27)2040298 (3.17)1904
7125 Or More304 (2.27)2045298 (3.17)1904

U.S. EPA ASM EMISSION STANDARDS - 1973-74 LIGHT DUTY VEHICLES

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
17501118 (8.02)49901098 (9.90)4980
18751052 (7.56)49901034 (9.90)4906
2000992 (7.14)4919975 (9.90)4838
2125938 (6.75)4853921 (9.66)4776
2250887 (6.40)4792872 (9.14)4720
2375841 (6.07)4736827 (8.67)4668
2500800 (5.78)4685786 (8.25)4620
2625761 (5.51)4639748 (7.85)4577
2750726 (5.26)4596714 (7.50)4374
2875695 (5.03)4484683 (7.17)4176
3000666 (4.83)4290654 (6.87)3996
3125639 (4.64)4114628 (6.60)3832
3250615 (4.47)3952604 (6.35)3681
3375593 (4.31)3804583 (6.13)3544
3500573 (4.17)3669563 (5.92)3418
3625554 (4.04)3544544 (5.73)3302
3750537 (3.91)3429527 (5.55)3195
3875521 (3.80)3323512 (5.39)3096
4000506 (3.70)3224497 (5.24)3003
4125492 (3.60)3131484 (5.09)2917
4250479 (3.51)3044471 (4.96)2836
4375467 (3.42)2961459 (4.83)2759
4500455 (3.34)2883447 (4.71)2686
4625444 (3.26)2807436 (4.60)2616
4750433 (3.18)2735425 (4.49)2549
4875423 (3.11)2665415 (4.38)2483
5000412 (3.03)2597405 (4.28)2420
5125402 (2.97)2530395 (4.18)2359
5250393 (2.90)2466386 (4.08)2298
5375383 (2.83)2403376 (3.98)2240
5500374 (2.77)2341367 (3.89)2183
5625365 (2.70)2282359 (3.80)2127
5750357 (2.64)2224350 (3.71)2074
5875348 (2.59)2168342 (3.62)2022
6000341 (2.53)2116334 (3.54)1973
6125333 (2.48)2066327 (3.47)1927
6250326 (2.43)2020320 (3.40)1884
6375320 (2.39)1979314 (3.34)1846
6500315 (2.35)1943309 (3.28)1813
6625310 (2.32)1913304 (3.23)1785
6750307 (2.29)1890301 (3.20)1764
6875305 (2.28)1875299 (3.17)1750
7000304 (2.27)1870298 (3.17)1745
7125 Or More304 (2.27)1874298 (3.17)1745

U.S. EPA ASM EMISSION STANDARDS - 1975-76 LIGHT DUTY VEHICLES

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750774 (3.92)4990761 (5.45)4980
1875729 (3.70)4990717 (5.14)4906
2000688 (3.49)4919676 (4.85)4838
2125650 (3.31)4853638 (4.58)4776
2250615 (3.13)4792604 (4.34)4720
2375583 (2.98)4736573 (4.12)4668
2500554 (2.83)4685544 (3.91)4620
2625528 (2.70)4639518 (3.73)4577
2750503 (2.58)4596495 (3.56)4374
2875481 (2.47)4484473 (3.41)4176
3000461 (2.37)4290453 (3.27)3996
3125443 (2.28)4114435 (3.14)3832
3250426 (2.20)3952419 (3.02)3681
3375411 (2.12)3804404 (2.91)3544
3500397 (2.05)3669390 (2.82)3418
3625384 (1.99)3544377 (2.73)3302
3750372 (1.93)3429365 (2.64)3195
3875361 (1.87)3323355 (2.57)3096
4000351 (1.82)3224345 (2.49)3003
4125341 (1.77)3131335 (2.43)2917
4250332 (1.73)3044326 (2.36)2836
4375323 (1.68)2961318 (2.31)2759
4500315 (1.64)2883310 (2.25)2686
4625308 (1.61)2807302 (2.19)2616
4750300 (1.57)2735295 (2.14)2549
4875293 (1.53)2665288 (2.09)2483
5000286 (1.50)2597281 (2.04)2420
5125279 (1.46)2530274 (2.00)2359
5250272 (1.43)2466267 (1.95)2298
5375266 (1.40)2403261 (1.90)2240
5500259 (1.37)2341255 (1.86)2183
5625253 (1.34)2282248 (1.82)2127
5750247 (1.31)2224243 (1.78)2074
5875241 (1.28)2168237 (1.74)2022
6000236 (1.25)2116232 (1.70)1973
6125231 (1.23)2066227 (1.66)1927
6250226 (1.20)2020222 (1.63)1884
6375222 (1.18)1979218 (1.60)1846
6500218 (1.16)1943214 (1.57)1813
6625215 (1.15)1913211 (1.55)1785
6750213 (1.14)1890209 (1.54)1764
6875211 (1.13)1875207 (1.52)1750
7000211 (1.12)1870207 (1.52)1745
7125 Or More211 (1.12)1874206 (1.52)1745

U.S. EPA ASM EMISSION STANDARDS - 1977-79 LIGHT DUTY VEHICLES

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750774 (3.92)4990761 (5.45)4950
1875729 (3.70)4990717 (5.14)4655
2000688 (3.49)4707676 (4.85)4384
2125650 (3.31)4441638 (4.58)4136
2250615 (3.13)4197604 (4.34)3909
2375583 (2.98)3974573 (4.12)3701
2500554 (2.83)3771544 (3.91)3512
2625528 (2.70)3585518 (3.73)3339
2750503 (2.58)3416495 (3.56)3181
2875481 (2.47)3261473 (3.41)3037
3000461 (2.37)3120453 (3.27)2906
3125443 (2.28)2992435 (3.14)2787
3250426 (2.20)2874419 (3.02)2677
3375411 (2.12)2767404 (2.91)2577
3500397 (2.05)2668390 (2.82)2486
3625384 (1.99)2578377 (2.73)2401
3750372 (1.93)2494365 (2.64)2323
3875361 (1.87)2417355 (2.57)2251
4000351 (1.82)2345345 (2.49)2184
4125341 (1.77)2277335 (2.43)2122
4250332 (1.73)2214326 (2.36)2063
4375323 (1.68)2154318 (2.31)2007
4500315 (1.64)2096310 (2.25)1953
4625308 (1.61)2042302 (2.19)1903
4750300 (1.57)1989295 (2.14)1854
4875293 (1.53)1938288 (2.09)1806
5000286 (1.50)1889281 (2.04)1760
5125279 (1.46)1840274 (2.00)1715
5250272 (1.43)1793267 (1.95)1672
5375266 (1.40)1747261 (1.90)1629
5500259 (1.37)1703255 (1.86)1587
5625253 (1.34)1659248 (1.82)1547
5750247 (1.31)1617243 (1.78)1508
5875241 (1.28)1577237 (1.74)1471
6000236 (1.25)1539232 (1.70)1435
6125231 (1.23)1503227 (1.66)1401
6250226 (1.20)1469222 (1.63)1371
6375222 (1.18)1439218 (1.60)1343
6500218 (1.16)1413214 (1.57)1318
6625215 (1.15)1391211 (1.55)1298
6750213 (1.14)1374209 (1.54)1283
6875211 (1.13)1364207 (1.52)1273
7000 Or More211 (1.12)1360207 (1.52)1269

U.S. EPA ASM EMISSION STANDARDS - 1980 LIGHT DUTY VEHICLES

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750291 (2.78)4990282 (3.64)4950
1875275 (2.63)4990266 (3.43)4655
2000260 (2.48)4707252 (3.24)4384
2125246 (2.35)4441239 (3.06)4136
2250234 (2.23)4197227 (2.90)3909
2375223 (2.12)3974216 (2.76)3701
2500212 (2.02)3771206 (2.62)3512
2625203 (1.92)3585197 (2.50)3339
2750194 (1.84)3416189 (2.39)3181
2875187 (1.76)3261181 (2.29)3037
3000180 (1.69)3120174 (2.19)2906
3125173 (1.63)2992168 (2.11)2787
3250167 (1.57)2874162 (2.03)2677
3375162 (1.52)2767157 (1.96)2577
3500157 (1.47)2668152 (1.89)2486
3625152 (1.42)2578148 (1.84)2401
3750148 (1.38)2492144 (1.78)2323
3875144 (1.34)2417140 (1.73)2251
4000140 (1.31)2345137 (1.68)2184
4125137 (1.27)2277133 (1.64)2122
4250134 (1.24)2214130 (1.60)2063
4375131 (1.21)2154127 (1.56)2007
4500128 (1.18)2096124 (1.52)1953
4625125 (1.15)2042122 (1.48)1903
4750122 (1.13)1989119 (1.45)1854
4875120 (1.10)1938117 (1.42)1806
5000117 (1.08)1889114 (1.38)1760
5125115 (1.05)1840112 (1.35)1715
5250112 (1.03)1793110 (1.32)1672
5375110 (1.01)1747107 (1.29)1629
5500108 (0.99)1703105 (1.26)1587
5625106 (0.97)1659103 (1.24)1547
5750104 (0.94)1617101 (1.21)1508
5875102 (0.92)157799 (1.18)1471
6000100 (0.91)153997 (1.16)1435
612598 (0.89)150395 (1.13)1401
625096 (0.87)146994 (1.11)1371
637595 (0.86)143992 (1.09)1343
650093 (0.84)141391 (1.08)1318
662592 (0.83)139190 (1.06)1298
675091 (0.82)137489 (1.05)1283
687591 (0.82)136489 (1.04)1273
700091 (0.82)136088 (1.04)1269
7125 Or More90 (0.81)136088 (1.04)1269

U.S. EPA ASM EMISSION STANDARDS - 1981-82 LIGHT DUTY VEHICLES

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750291 (2.78)2272282 (3.64)2114
1875275 (2.63)2181266 (3.43)1991
2000260 (2.48)2058252 (3.24)1877
2125246 (2.35)1944239 (3.06)1774
2250234 (2.23)1839227 (2.90)1678
2375223 (2.12)1744216 (2.76)1592
2500212 (2.02)1657206 (2.62)1512
2625203 (1.92)1577197 (2.50)1440
2750194 (1.84)1504189 (2.39)1374
2875187 (1.76)1438181 (2.29)1313
3000180 (1.69)1378174 (2.19)1258
3125173 (1.63)1323168 (2.11)1208
3250167 (1.57)1273162 (2.03)1163
3375162 (1.52)1227157 (1.96)1121
3500157 (1.47)1184152 (1.89)1082
3625152 (1.42)1146148 (1.84)1047
3750148 (1.38)1110144 (1.78)1014
3875144 (1.34)1077140 (1.73)984
4000140 (1.31)1046137 (1.68)956
4125137 (1.27)1017133 (1.64)930
4250134 (1.24)990130 (1.60)905
4375131 (1.21)964127 (1.56)882
4500128 (1.18)939124 (1.52)859
4625125 (1.15)916122 (1.48)838
4750122 (1.13)893119 (1.45)818
4875120 (1.10)872117 (1.42)798
5000117 (1.08)850114 (1.38)778
5125115 (1.05)830112 (1.35)760
5250112 (1.03)810110 (1.32)741
5375110 (1.01)790107 (1.29)723
5500108 (0.99)771105 (1.26)706
5625106 (0.97)752103 (1.24)689
5750104 (0.94)734101 (1.21)673
5875102 (0.92)71799 (1.18)657
6000100 (0.91)70197 (1.16)642
612598 (0.89)68595 (1.13)628
625096 (0.87)67194 (1.11)615
637595 (0.86)65892 (1.09)604
650093 (0.84)64791 (1.08)593
662592 (0.83)63890 (1.06)585
675091 (0.82)63189 (1.05)578
687591 (0.82)62689 (1.04)574
700091 (0.82)62488 (1.04)573
7125 Or More90 (0.81)62588 (1.04)573

U.S. EPA ASM EMISSION STANDARDS - 1983-90 LIGHT DUTY VEHICLES

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750291 (1.64)2272282 (1.83)2114
1875275 (1.55)2181266 (1.72)1991
2000260 (1.47)2058252 (1.63)1877
2125246 (1.39)1944239 (1.54)1774
2250234 (1.31)1839227 (1.47)1678
2375223 (1.26)1744216 (1.39)1592
2500212 (1.20)1657206 (1.33)1512
2625203 (1.15)1577197 (1.27)1440
2750194 (1.10)1504189 (1.21)1374
2875187 (1.05)1438181 (1.16)1313
3000180 (1.01)1378174 (1.12)1258
3125173 (0.98)1323168 (1.08)1208
3250167 (0.94)1273162 (1.04)1163
3375162 (0.91)1227157 (1.00)1121
3500157 (0.88)1184152 (0.97)1082
3625152 (0.86)1146148 (0.94)1047
3750148 (0.83)1110144 (0.92)1014
3875144 (0.81)1077140 (0.89)984
4000140 (0.79)1046137 (0.87)956
4125137 (0.77)1017133 (0.85)930
4250134 (0.75)990130 (.83)905
4375131 (0.74)964127 (0.81)882
4500128 (0.72)939124 (0.79)859
4625125 (0.70)916122 (0.77)838
4750122 (0.69)893119 (0.76)818
4875120 (0.67)872117 (0.74)798
5000117 (0.66)850114 (0.73)778
5125115 (0.65)830112 (0.71)760
5250112 (0.63)810110 (0.70)741
5375110 (0.62)790107 (0.68)723
5500108 (0.61)771105 (0.67)706
5625106 (0.59)752103 (0.65)689
5750104 (0.58)734101 (0.64)673
5875102 (0.57)71799 (0.63)657
6000100 (0.56)70197 (0.62)642
612598 (0.55)68595 (0.61)628
625096 (0.54)67194 (0.60)615
637595 (0.53)65892 (0.59)604
650093 (0.52)64791 (0.58)593
662592 (0.52)63890 (0.57)585
675091 (0.51)63189 (0.57)578
687591 (0.51)62689 (0.56)574
700091 (0.51)62488 (0.56)573
712590 (0.51)62588 (0.56)573
7250 Or More90 (0.50)62588 (0.56)573

U.S. EPA ASM EMISSION STANDARDS - 1991-95 LIGHT DUTY VEHICLES

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750224 (1.26)1819216 (1.22)1642
1875212 (1.19)1713205 (1.16)1547
2000201 (1.13)1616194 (1.09)1460
2125191 (1.07)1527184 (1.04)1380
2250182 (1.02)1446175 (0.99)1307
2375173 (0.97)1372167 (0.94)1240
2500166 (0.93)1304160 (0.90)1179
2625159 (0.89)1242153 (0.86)1123
2750152 (0.85)1186147 (0.82)1072
2875146 (0.82)1134141 (0.79)1026
3000141 (0.79)1088136 (0.76)984
3125136 (0.76)1045132 (0.73)945
3250132 (0.73)1006127 (0.71)910
3375128 (0.71)970123 (0.69)878
3500124 (0.69)937120 (0.67)848
3625120 (0.67)907117 (0.65)821
3750117 (0.65)879114 (0.63)796
3875114 (0.63)853111 (0.61)773
4000112 (0.62)829108 (0.60)751
4125109 (0.60)807106 (0.58)731
4250107 (0.59)786103 (0.57)712
4375104 (0.58)766101 (0.56)694
4500102 (0.57)74799 (0.55)677
4625100 (0.55)72897 (0.54)661
475098 (0.54)71195 (0.53)645
487596 (0.53)69493 (0.52)630
500094 (0.52)67792 (0.51)615
512593 (0.51)66190 (0.50)600
525091 (0.50)64688 (0.49)586
537589 (0.49)63186 (0.48)573
550087 (0.48)61685 (0.47)559
562586 (0.47)60183 (0.46)546
575084 (0.46)58782 (0.45)534
587583 (0.45)57480 (0.44)522
600081 (0.44)56179 (0.44)510
612580 (0.44)54978 (0.43)499
625079 (0.43)53876 (0.42)489
637577 (0.42)52875 (0.42)480
650076 (0.42)51974 (0.41)473
662576 (0.41)51274 (0.41)466
675075 (0.41)50773 (0.41)461
687575 (0.40)50373 (0.40)458
7000 Or More74 (0.40)50272 (0.40)457

U.S. EPA ASM EMISSION STANDARDS - 1994 & NEWER + TIER 1 LIGHT DUTY VEHICLES

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750142 (0.80)1212136 (0.77)1095
1875134 (0.75)1142129 (0.73)1031
2000127 (0.71)1077123 (0.69)973
2125121 (0.68)1018116 (0.66)920
2250115 (0.64)964111 (0.62)871
2375109 (0.61)915106 (0.59)827
2500105 (0.59)869101 (0.57)786
2625100 (0.56)82897 (0.54)749
275096 (0.54)79193 (0.52)715
287592 (0.52)75689 (0.50)684
300089 (0.50)72586 (0.48)656
312586 (0.48)69683 (0.46)630
325083 (0.46)67080 (0.45)607
337581 (0.45)64778 (0.43)585
350078 (0.44)62576 (0.42)566
362576 (0.42)60574 (0.41)547
375074 (0.41)58672 (0.40)531
387572 (0.40)56970 (0.39)515
400071 (0.39)55368 (0.38)501
412569 (0.38)53867 (0.37)487
425067 (0.37)52465 (0.36)475
437566 (0.36)51064 (0.35)463
450065 (0.36)49863 (0.35)440
462563 (0.35)48661 (0.34)440
475062 (0.34)47460 (0.33)430
487561 (0.34)46359 (0.33)420
500060 (0.33)45258 (0.32)410
512558 (0.32)44157 (0.31)400
525057 (0.32)43156 (0.31)391
537556 (0.31)42055 (0.30)382
550055 (0.30)41054 (0.30)373
562554 (0.30)40153 (0.29)364
575053 (0.29)39152 (0.29)356
587552 (0.29)38351 (0.28)348
600051 (0.28)37450 (0.28)340
612550 (0.28)36649 (0.27)333
625050 (0.27)35948 (0.27)326
637549 (0.27)35248 (0.26)320
650048 (0.26)34647 (0.26)315
662548 (0.26)34146 (0.26)311
675047 (0.26)33846 (0.26)307
687547 (0.26)33546 (0.25)305
7000 Or More47 (0.25)33546 (0.25)305

U.S. EPA ASM EMISSION STANDARDS - 1968-72 LIGHT DUTY TRUCKS (6000 GVWR OR LESS)

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
17501118 (8.02)49901098 (9.90)4990
18751052 (7.56)49901034 (9.90)4990
2000992 (7.14)4990975 (9.90)4990
2125938 (6.75)4990921 (9.66)4990
2250887 (6.40)4990872 (9.14)4990
2375841 (6.07)4990827 (8.67)4990
2500800 (5.78)4990786 (8.25)4990
2625761 (5.51)4990748 (7.85)4990
2750726 (5.26)4990714 (7.50)4772
2875695 (5.03)4892683 (7.17)4556
3000666 (4.83)4680654 (6.87)4359
3125639 (4.64)4488628 (6.60)4180
3250615 (4.47)4311604 (6.35)4016
3375593 (4.31)4150583 (6.13)3866
3500573 (4.17)4002563 (5.92)3728
3625554 (4.04)3867544 (5.73)3602
3750537 (3.91)3741527 (5.55)3485
3875521 (3.80)3625512 (5.39)3377
4000506 (3.70)3517497 (5.24)3276
4125492 (3.60)3416484 (5.09)3182
4250479 (3.51)3321471 (4.96)3094
4375467 (3.42)3230459 (4.83)3010
4500455 (3.34)3145447 (4.71)2930
4625444 (3.26)3063436 (4.60)2854
4750433 (3.18)2983425 (4.49)2780
4875423 (3.11)2907415 (4.38)2709
5000412 (3.03)2833405 (4.28)2540
5125402 (2.97)2760395 (4.18)2573
5250393 (2.90)2690386 (4.08)2507
5375383 (2.83)2621376 (3.98)2443
5500374 (2.77)2554367 (3.89)2381
5625365 (2.70)2489359 (3.80)2321
5750357 (2.64)2426350 (3.71)2262
5875348 (2.59)2366342 (3.62)2206
6000341 (2.53)2308334 (3.54)2152
6125333 (2.48)2254327 (3.47)2102
6250326 (2.43)2204320 (3.40)2056
6375320 (2.39)2159314 (3.34)2014
6500315 (2.35)2119309 (3.28)1977
6625310 (2.32)2087304 (3.23)1947
6750307 (2.29)2062301 (3.20)1924
6875305 (2.28)2046299 (3.17)1909
7000304 (2.27)2040298 (3.17)1904
7125 Or More304 (2.27)2045298 (3.17)1904

U.S. EPA ASM EMISSION STANDARDS - 1973-74 LIGHT DUTY TRUCKS (6000 GVWR OR LESS)

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
17501118 (8.02)49901098 (9.90)4980
18751052 (7.56)49901034 (9.90)4906
2000992 (7.14)4919975 (9.90)4838
2125938 (6.75)4853921 (9.66)4776
2250887 (6.40)4792872 (9.14)4720
2375841 (6.07)4736827 (8.67)4668
2500800 (5.78)4685786 (8.25)4620
2625761 (5.51)4639748 (7.85)4577
2750726 (5.26)4596714 (7.50)4374
2875695 (5.03)4484683 (7.17)4176
3000666 (4.83)4290654 (6.87)3996
3125639 (4.64)4114628 (6.60)3832
3250615 (4.47)3952604 (6.35)3681
3375593 (4.31)3804583 (6.13)3544
3500573 (4.17)3669563 (5.92)3418
3625554 (4.04)3544544 (5.73)3302
3750537 (3.91)3429527 (5.55)3195
3875521 (3.80)3323512 (5.39)3096
4000506 (3.70)3224497 (5.24)3003
4125492 (3.60)3131484 (5.09)2917
4250479 (3.51)3044471 (4.96)2836
4375467 (3.42)2961459 (4.83)2759
4500455 (3.34)2883447 (4.71)2686
4625444 (3.26)2807436 (4.60)2616
4750433 (3.18)2735425 (4.49)2549
4875423 (3.11)2665415 (4.38)2483
5000412 (3.03)2597405 (4.28)2420
5125402 (2.97)2530395 (4.18)2359
5250393 (2.90)2466386 (4.08)2298
5375383 (2.83)2403376 (3.98)2240
5500374 (2.77)2341367 (3.89)2183
5625365 (2.70)2282359 (3.80)2127
5750357 (2.64)2224350 (3.71)2074
5875348 (2.59)2168342 (3.62)2022
6000341 (2.53)2116334 (3.54)1973
6125333 (2.48)2066327 (3.47)1927
6250326 (2.43)2020320 (3.40)1884
6375320 (2.39)1979314 (3.34)1846
6500315 (2.35)1943309 (3.28)1813
6625310 (2.32)1913304 (3.23)1785
6750307 (2.29)1890301 (3.20)1764
6875305 (2.28)1875299 (3.17)1750
7000304 (2.27)1870298 (3.17)1745
7125 Or More304 (2.27)1874298 (3.17)1745

U.S. EPA ASM EMISSION STANDARDS - 1975-78 LIGHT DUTY TRUCKS (6000 GVWR OR LESS)

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750843 (5.07)4990828 (7.26)4980
1875794 (4.78)4990780 (6.84)4906
2000749 (4.51)4919736 (6.45)4838
2125707 (4.26)4853695 (6.10)4776
2250669 (4.04)4792658 (5.78)4720
2375635 (3.83)4736624 (5.48)4668
2500603 (3.65)4685593 (5.21)4620
2625574 (3.48)4639564 (4.96)4577
2750548 (3.32)4596539 (4.73)4374
2875524 (3.18)4484515 (4.53)4176
3000502 (3.05)4290493 (4.34)3996
3125482 (2.93)4114474 (4.17)3832
3250464 (2.82)3952456 (4.01)3681
3375447 (2.72)3804440 (3.87)3544
3500432 (2.63)3669424 (3.74)3418
3625418 (2.55)3544411 (3.62)3302
3750405 (2.47)3429398 (3.51)3195
3875393 (2.40)3323386 (3.40)3096
4000382 (2.33)3224375 (3.31)3003
4125371 (2.27)3131365 (3.22)2917
4250361 (2.21)3044355 (3.13)2836
4375352 (2.16)2961346 (3.05)2759
4500343 (2.11)2883337 (2.98)2686
4625335 (2.06)2807329 (2.90)2616
4750327 (2.01)2735321 (2.83)2549
4875319 (1.96)2665313 (2.77)2483
5000311 (1.92)2597305 (2.70)2420
5125304 (1.87)2530298 (2.64)2359
5250296 (1.83)2466291 (2.58)2298
5375289 (1.79)2403284 (2.51)2240
5500282 (1.75)2341277 (2.46)2183
5625276 (1.71)2282271 (2.40)2127
5750269 (1.67)2224264 (2.34)2074
5875263 (1.63)2168258 (2.29)2022
6000257 (1.60)2116252 (2.24)1973
6125251 (1.57)2066247 (2.19)1927
6250246 (1.54)2020242 (2.15)1884
6375242 (1.51)1979237 (2.11)1846
6500238 (1.48)1943233 (2.07)1813
6625234 (1.46)1913230 (2.04)1785
6750232 (1.45)1890227 (2.02)1764
6875230 (1.44)1875225 (2.00)1750
7000229 (1.43)1870225 (2.00)1745
7125 Or More229 (1.43)1874225 (2.00)1745

U.S. EPA ASM EMISSION STANDARDS - 1979-83 LIGHT DUTY TRUCKS (6000 GVWR OR LESS)

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750774 (4.31)4990761 (6.06)4960
1875729 (4.06)4990717 (5.70)4738
2000688 (3.83)4778676 (5.38)4535
2125650 (3.63)4578638 (5.09)4349
2250615 (3.44)4395604 (4.82)4179
2375583 (3.26)4228573 (4.57)4024
2500554 (3.10)4076544 (4.35)3881
2625528 (2.96)3936518 (4.14)3752
2750503 (2.83)3809495 (3.95)3579
2875481 (2.71)3669473 (3.78)3417
3000461 (2.60)3510453 (3.62)3270
3125443 (2.50)3366435 (3.48)3135
3250426 (2.40)3234419 (3.35)3012
3375411 (2.32)3113404 (3.23)2899
3500397 (2.24)3002390 (3.12)2796
3625384 (2.17)2900377 (3.02)2701
3750372 (2.11)2806365 (2.93)2614
3875361 (2.05)2719355 (2.58)2533
4000351 (1.99)2638345 (2.77)2457
4125341 (1.94)2562335 (2.69)2387
4250332 (1.89)2490326 (2.62)2320
4375323 (1.84)2423318 (2.55)2258
4500315 (1.80)2359310 (2.49)2198
4625308 (1.76)2297302 (2.43)2140
4750300 (1.72)2238295 (2.37)2085
4875293 (1.68)2180288 (2.32)2032
5000286 (1.64)2125281 (2.26)1980
5125279 (1.60)2070274 (2.21)1930
5250272 (1.56)2017267 (2.16)1881
537526 (1.53)1966261 (2.11)1833
5500259 (1.49)1916255 (2.06)1786
5625253 (1.46)1867248 (2.01)1740
5750247 (1.43)1820243 (1.96)1697
5875241 (1.40)1774237 (1.92)1654
6000236 (1.37)1731232 (1.88)1614
6125231 (1.34)1690227 (1.84)1577
6250226 (1.31)1653222 (1.80)1542
6375222 (1.29)1619218 (1.77)1510
6500218 (1.27)1590214 (1.74)1483
6625215 (1.25)1565211 (1.72)1460
6750213 (1.24)1546209 (1.70)1443
6875211 (1.23)1534207 (1.68)1432
7000211 (1.23)1530207 (1.68)1428
7125 Or More211 (1.22)1531206 (1.68)1428

U.S. EPA ASM EMISSION STANDARDS - 1984-87 LIGHT DUTY TRUCKS (6000 GVWR OR LESS)

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750390 (3.54)4990381 (4.85)4960
1875368 (3.34)4990359 (4.57)4738
2000348 (3.16)4778339 (4.31)4535
2125329 (2.99)4578321 (4.08)4349
2250312 (2.83)4395305 (3.86)4179
2375297 (2.69)4228290 (3.66)4024
2500283 (2.56)4076276 (3.48)3881
2625270 (2.44)3936263 (3.32)3752
2750258 (2.33)3809252 (3.17)3579
2875247 (2.23)3669241 (3.03)3417
3000237 (2.14)3510232 (2.91)3270
3125228 (2.06)3366223 (2.79)3135
3250220 (1.99)3234215 (2.69)3012
3375213 (1.92)3113208 (2.60)2899
3500206 (1.86)3002201 (2.51)2796
3625200 (1.80)2900195 (2.43)2701
3750194 (1.74)2806189 (2.36)2614
3875188 (1.69)2719184 (2.29)2533
4000183 (1.65)2638179 (2.22)2457
4125179 (1.61)2562175 (2.16)2387
4250174 (1.56)2490170 (2.11)2320
4375170 (1.53)2423166 (2.06)2258
4500166 (1.49)2359162 (2.01)2198
4625162 (1.46)2297159 (1.96)2140
4750159 (1.42)2238155 (1.91)2085
4875155 (1.39)2180152 (1.87)2032
5000152 (1.36)2125148 (1.82)1980
5125148 (1.33)2070145 (1.78)1930
5250145 (1.30)2017142 (1.74)1881
5375142 (1.27)1966139 (1.70)1833
5500139 (1.24)1916136 (1.66)1786
5625136 (1.12)1867133 (1.62)1740
5750133 (1.19)1820130 (1.59)1697
5875130 (1.16)1774127 (1.55)1654
6000127 (1.14)1731124 (1.52)1614
6125125 (1.11)1690122 (1.49)1577
6250123 (1.09)1653120 (1.46)1542
6375120 (1.07)1619118 (1.43)1510
6500119 (1.06)1590116 (1.41)1483
6625117 (1.04)1565114 (1.39)1460
6750116 (1.03)1546113 (1.37)1443
6875115 (1.02)1534113 (1.36)1432
7000115 (1.02)1530112 (1.36)1428
7125 Or More115 (1.02)1531112 (1.36)1428

U.S. EPA ASM EMISSION STANDARDS - 1988-90 LIGHT DUTY TRUCKS (6000 GVWR OR LESS)

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750390 (3.54)2725381 (4.85)2587
1875368 (3.34)2649359 (4.57)2435
2000348 (3.16)2499339 (4.31)2295
2125329 (2.99)2360321 (4.08)2167
2250312 (2.83)2232305 (3.86)2050
2375297 (2.69)2115290 (3.66)1943
2500283 (2.56)2009276 (3.48)1845
2625270 (2.44)1912263 (3.32)1756
2750258 (2.33)1823252 (3.17)1675
2875247 (2.23)1742241 (3.03)1601
3000237 (2.14)1668232 (2.91)1533
3125228 (2.06)1601223 (2.79)1471
3250220 (1.99)1539215 (2.69)1415
3375213 (1.92)1483208 (2.60)1363
3500206 (1.86)1432201 (2.51)1316
3625200 (1.80)1384195 (2.43)1273
3750194 (1.74)1340189 (2.36)1233
3875188 (1.69)1300184 (2.29)1195
4000183 (1.65)1262179 (2.22)1161
4125179 (1.61)1227175 (2.16)1126
4250174 (1.56)1194170 (2.11)1098
4375170 (1.53)1162166 (2.06)1069
4500166 (1.49)1132162 (2.01)1042
4625162 (1.46)1104159 (1.96)1015
4750159 (1.42)1076155 (1.91)990
4875155 (1.39)1049152 (1.87)966
5000152 (1.36)1023148 (1.82)942
5125148 (1.33)998145 (1.78)919
5250145 (1.30)974142 (1.74)896
5375142 (1.27)950139 (1.70)874
5500139 (1.24)926136 (1.66)853
5625136 (1.12)904133 (1.62)832
5750133 (1.19)882130 (1.59)812
5875130 (1.16)860127 (1.55)793
6000127 (1.14)840124 (1.52)774
6125125 (1.11)822122 (1.49)757
6250123 (1.09)804120 (1.46)741
6375120 (1.07)788118 (1.43)727
6500119 (1.06)775116 (1.41)714
6625117 (1.04)763114 (1.39)704
6750116 (1.03)755113 (1.37)696
6875115 (1.02)749113 (1.36)691
7000 Or More115 (1.02)747112 (1.36)689

U.S. EPA ASM EMISSION STANDARDS - 1991-95 LIGHT DUTY TRUCKS (6000 GVWR OR LESS)

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750324 (2.78)2272315 (3.64)2114
1875306 (2.63)2181297 (3.43)1991
2000289 (2.48)2058281 (3.24)1877
2125274 (2.35)1944267 (3.06)1774
2250260 (2.23)1839253 (2.90)1678
2375247 (2.12)1744241 (2.76)1592
2500236 (2.02)1657230 (2.62)1512
2625225 (1.92)1577219 (2.50)1440
2750216 (1.84)1504210 (2.39)1374
2875207 (1.76)1438210 (2.29)1313
3000199 (1.69)1378194 (2.19)1258
3125191 (1.63)1323186 (2.11)1208
3250185 (1.57)1273180 (2.03)1163
3375179 (1.52)1227174 (1.96)1121
3500173 (1.47)1184169 (1.89)1082
3625168 (1.42)1146164 (1.84)1047
3750163 (1.38)1110159 (1.78)1014
3875159 (1.34)1077155 (1.73)984
4000155 (1.31)1046151 (1.68)956
4125151 (1.27)1017147 (1.64)930
4250147 (1.24)990143 (1.60)905
4375144 (1.21)964140 (1.56)882
4500141 (1.18)939137 (1.52)859
4625137 (1.15)916134 (1.48)838
4750134 (1.13)893131 (1.45)818
4875132 (1.10)872128 (1.42)798
5000129 (1.08)850126 (1.38)778
5125126 (1.05)830123 (1.35)760
5250123 (1.03)810120 (1.32)741
5375121 (1.01)790118 (1.29)723
5500118 (0.99)771115 (1.26)706
5625116 (0.97)752113 (1.24)689
5750113 (0.94)734111 (1.21)673
5875111 (0.92)717108 (1.18)657
6000109 (0.91)701106 (1.16)642
6125107 (0.89)685104 (1.13)628
6250105 (.087)671102 (1.11)615
6375103 (0.86)658101 (1.09)604
6500102 (0.84)64799 (1.08)593
6625101 (0.83)63898 (1.06)585
6750100 (0.82)63197 (1.05)578
687599 (0.82)62697 (1.04)574
700099 (0.82)62496 (1.04)573
7125 Or More98 (0.81)62596 (1.04)573

U.S. EPA ASM EMISSION STANDARDS - 1994 + TIER 1 LIGHT DUTY TRUCKS (3750 LVW OR LESS)

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750142 (0.80)1212136 (0.77)1095
1875134 (0.75)1142129 (0.73)1031
2000127 (0.71)1077123 (0.69)973
2125121 (0.68)1018116 (0.66)920
2250115 (0.64)964111 (0.62)871
2375109 (0.61)915106 (0.59)827
2500105 (0.59)869101 (0.57)786
2625100 (0.56)82897 (0.54)749
275096 (0.54)79193 (0.52)715
287592 (0.52)75689 (0.50)684
300089 (0.50)72586 (0.48)656
312586 (0.48)69683 (0.46)630
325083 (0.46)67080 (0.45)607
337581 (0.45)64778 (0.43)585
350078 (0.44)62576 (0.42)566
362576 (0.42)60574 (0.41)547
375074 (0.41)58672 (0.40)531
387572 (0.40)56970 (0.39)515
400071 (0.39)55368 (0.38)501
412569 (0.38)53867 (0.37)487
425067 (0.37)52465 (0.36)475
437566 (0.36)51064 (0.35)463
450065 (0.36)49863 (0.35)440
462563 (0.35)48661 (0.34)440
475062 (0.34)47460 (0.33)430
487561 (0.34)46359 (0.33)420
500060 (0.33)45258 (0.32)410
512558 (0.32)44157 (0.31)400
525057 (0.32)43156 (0.31)391
537556 (0.31)42055 (0.30)382
550055 (0.30)41054 (0.30)373
562554 (0.30)40153 (0.29)364
575053 (0.29)39152 (0.29)356
587552 (0.29)38351 (0.28)348
600051 (0.28)37450 (0.28)340
612550 (0.28)36649 (0.27)333
625050 (0.27)35948 (0.27)326
637549 (0.27)35248 (0.26)320
650048 (0.26)34647 (0.26)315
662548 (0.26)34146 (0.26)311
675047 (0.26)33846 (0.26)307
687547 (0.26)33546 (0.25)305
7000 Or More47 (0.25)33546 (0.25)305

U.S. EPA ASM EMISSION STANDARDS - 1994 + TIER 1 LIGHT DUTY TRUCKS (3751 LVW OR MORE)

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750224 (1.26)1819216 (1.22)1642
1875212 (1.19)1713205 (1.16)1547
2000201 (1.13)1616194 (1.09)1460
2125191 (1.07)1527184 (1.04)1380
2250182 (1.02)1446175 (0.99)1307
2375173 (0.97)1372167 (0.94)1240
2500166 (0.93)1304160 (0.90)1179
2625159 (0.89)1242153 (0.86)1123
2750152 (0.85)1186147 (0.82)1072
2875146 (0.82)1134141 (0.79)1026
3000141 (0.79)1088136 (0.76)984
3125136 (0.76)1045132 (0.73)945
3250132 (0.73)1006127 (0.71)910
3375128 (0.71)970123 (0.69)878
3500124 (0.69)937120 (0.67)848
3625120 (0.67)907117 (0.65)821
3750117 (0.65)879114 (0.63)796
3875114 (0.63)853111 (0.61)773
4000112 (0.62)829108 (0.60)751
4125109 (0.60)807106 (0.58)731
4250107 (0.59)786103 (0.57)712
4375104 (0.58)766101 (0.56)694
4500102 (0.57)74799 (0.55)677
4625100 (0.55)72897 (0.54)661
475098 (0.54)71195 (0.53)645
487596 (0.53)69493 (0.52)630
500094 (0.52)67792 (0.51)615
512593 (0.51)66190 (0.50)600
525091 (0.50)64688 (0.49)586
537589 (0.49)63186 (0.48)573
550087 (0.48)61685 (0.47)559
562586 (0.47)60183 (0.46)546
575084 (0.46)58782 (0.45)534
587583 (0.45)57480 (0.44)522
600081 (0.44)56179 (0.44)510
612580 (0.44)54978 (0.43)499
625079 (0.43)53876 (0.42)489
637577 (0.42)52875 (0.42)480
650076 (0.42)51974 (0.41)473
662576 (0.41)51274 (0.41)466
675075 (0.41)50773 (0.41)461
687575 (0.40)50373 (0.40)458
7000 Or More74 (0.40)50272 (0.40)457

U.S. EPA ASM EMISSION STANDARDS - 1968-72 LIGHT DUTY TRUCKS (6001 GVWR OR MORE)

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
17501118 (8.02)49901098 (9.90)4990
18751052 (7.56)49901034 (9.90)4990
2000992 (7.14)4990975 (9.90)4990
2125938 (6.75)4990921 (9.66)4990
2250887 (6.40)4990872 (9.14)4990
2375841 (6.07)4990827 (8.67)4990
2500800 (5.78)4990786 (8.25)4990
2625761 (5.51)4990748 (7.85)4990
2750726 (5.26)4990714 (7.50)4772
2875695 (5.03)4892683 (7.17)4556
3000666 (4.83)4680654 (6.87)4359
3125639 (4.64)4488628 (6.60)4180
3250615 (4.47)4311604 (6.35)4016
3375593 (4.31)4150583 (6.13)3866
3500573 (4.17)4002563 (5.92)3728
3625554 (4.04)3867544 (5.73)3602
3750537 (3.91)3741527 (5.55)3485
3875521 (3.80)3625512 (5.39)3377
4000506 (3.70)3517497 (5.24)3276
4125492 (3.60)3416484 (5.09)3182
4250479 (3.51)3321471 (4.96)3094
4375467 (3.42)3230459 (4.83)3010
4500455 (3.34)3145447 (4.71)2930
4625444 (3.26)3063436 (4.60)2854
4750433 (3.18)2983425 (4.49)2780
4875423 (3.11)2907415 (4.38)2709
5000412 (3.03)2833405 (4.28)2640
5125402 (2.97)2760395 (4.18)2573
5250393 (2.90)2690386 (4.08)2507
5375383 (2.83)2621376 (3.98)2443
5500374 (2.77)2554367 (3.89)2381
5625365 (2.70)2489359 (3.80)2321
5750357 (2.64)2426350 (3.71)2262
5875348 (2.59)2366342 (3.62)2206
6000341 (2.53)2308334 (3.54)2152
6125333 (2.48)2254327 (3.47)2102
6250326 (2.43)2204320 (3.40)2056
6375320 (2.39)2159314 (3.34)2014
6500315 (2.35)2119309 (3.28)1977
6625310 (2.32)2087304 (3.23)1947
6750307 (2.29)2062301 (3.20)1924
6875305 (2.28)2046299 (3.17)1909
7000304 (2.27)2040298 (3.17)1904
7125 Or More304 (2.27)2045298 (3.17)1904

U.S. EPA ASM EMISSION STANDARDS - 1973-74 LIGHT DUTY TRUCKS (6001 GVWR OR MORE)

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
17501118 (8.02)49901098 (9.90)4980
18751052 (7.56)49901034 (9.90)4906
2000992 (7.14)4919975 (9.90)4838
2125938 (6.75)4853921 (9.66)4776
2250887 (6.40)4792872 (9.14)4720
2375841 (6.07)4736827 (8.67)4668
2500800 (5.78)4685786 (8.25)4620
2625761 (5.51)4639748 (7.85)4577
2750726 (5.26)4596714 (7.50)4374
2875695 (5.03)4484683 (7.17)4176
3000666 (4.83)4290654 (6.87)3996
3125639 (4.64)4114628 (6.60)3832
3250615 (4.47)3952604 (6.35)3681
3375593 (4.31)3804583 (6.13)3544
3500573 (4.17)3669563 (5.92)3418
3625554 (4.04)3544544 (5.73)3302
3750537 (3.91)3429527 (5.55)3195
3875521 (3.80)3323512 (5.39)3096
4000506 (3.70)3224497 (5.24)3003
4125492 (3.60)3131484 (5.09)2917
4250479 (3.51)3044471 (4.96)2836
4375467 (3.42)2961459 (4.83)2759
4500455 (3.34)2883447 (4.71)2686
4625444 (3.26)2807436 (4.60)2616
4750433 (3.18)2735425 (4.49)2549
4875423 (3.11)2665415 (4.38)2483
5000412 (3.03)2597405 (4.28)2420
5125402 (2.97)2530395 (4.18)2359
5250393 (2.90)2466386 (4.08)2298
5375383 (2.83)2403376 (3.98)2240
5500374 (2.77)2341367 (3.89)2183
5625365 (2.70)2282359 (3.80)2127
5750357 (2.64)2224350 (3.71)2074
5875348 (2.59)2168342 (3.62)2022
6000341 (2.53)2116334 (3.54)1973
6125333 (2.48)2066327 (3.47)1927
6250326 (2.43)2020320 (3.40)1884
6375320 (2.39)1979314 (3.34)1846
6500315 (2.35)1943309 (3.28)1813
6625310 (2.32)1913304 (3.23)1785
6750307 (2.29)1890301 (3.20)1764
6875305 (2.28)1875299 (3.17)1750
7000304 (2.27)1870298 (3.17)1745
7125 Or More304 (2.27)1874298 (3.17)1745

U.S. EPA ASM EMISSION STANDARDS - 1975-78 LIGHT DUTY TRUCKS (6001 GVWR OR MORE)

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750843 (5.07)4990828 (7.26)4980
1875794 (4.78)4990780 (6.84)4906
2000749 (4.51)4919736 (6.45)4838
2125707 (4.26)4853695 (6.10)4776
2250669 (4.04)4792658 (5.78)4720
2375635 (3.83)4736624 (5.48)4668
2500603 (3.65)4685593 (5.21)4620
2625574 (3.48)4639564 (4.96)4577
2750548 (3.32)4596539 (4.73)4374
2875524 (3.18)4484515 (4.53)4176
3000502 (3.05)4290493 (4.34)3996
3125482 (2.93)4114474 (4.17)3832
3250464 (2.82)3952456 (4.01)3681
3375447 (2.72)3804440 (3.87)3544
3500432 (2.63)3669424 (3.74)3418
3625418 (2.55)3544411 (3.62)3302
3750405 (2.47)3429398 (3.51)3195
3875393 (2.40)3323386 (3.40)3096
4000382 (2.33)3224375 (3.31)3003
4125371 (2.27)3131365 (3.22)2917
4250361 (2.21)3044355 (3.13)2836
4375352 (2.16)2961346 (3.05)2759
4500343 (2.11)2883337 (2.98)2686
4625335 (2.06)2807329 (2.90)2616
4750327 (2.01)2735321 (2.83)2549
4875319 (1.96)2665313 (2.77)2483
5000311 (1.92)2597305 (2.70)2420
5125304 (1.87)2530298 (2.64)2359
5250296 (1.83)2466291 (2.58)2298
5375289 (1.79)2403284 (2.51)2240
5500282 (1.75)2341277 (2.46)2183
5625276 (1.71)2282271 (2.40)2127
5750269 (1.67)2224264 (2.34)2074
5875263 (1.63)2168258 (2.29)2022
6000257 (1.60)2116252 (2.24)1973
6125251 (1.57)2066247 (2.19)1927
6250246 (1.54)2020242 (2.15)1884
6375242 (1.51)1979237 (2.11)1846
6500238 (1.48)1943233 (2.07)1813
6625234 (1.46)1913230 (2.04)1785
6750232 (1.45)1890227 (2.02)1764
6875230 (1.44)1875225 (2.00)1750
7000229 (1.43)1870225 (2.00)1745
7125 Or More229 (1.43)1874225 (2.00)1745

U.S. EPA ASM EMISSION STANDARDS - 1979-83 LIGHT DUTY TRUCKS (6001 GVWR OR MORE)

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750774 (4.31)4990761 (6.06)4960
1875729 (4.06)4990717 (5.70)4738
2000688 (3.83)4778676 (5.38)4535
2125650 (3.63)4578638 (5.09)4349
2250615 (3.44)4395604 (4.82)4179
2375583 (3.26)4228573 (4.57)4024
2500554 (3.10)4076544 (4.35)3881
2625528 (2.96)3936518 (4.14)3752
2750503 (2.83)3809495 (3.95)3579
2875481 (2.71)3669473 (3.78)3417
3000461 (2.60)3510453 (3.62)3270
3125443 (2.50)3366435 (3.48)3135
3250426 (2.40)3234419 (3.35)3012
3375411 (2.32)3113404 (3.23)2899
3500397 (2.24)3002390 (3.12)2796
3625384 (2.17)2900377 (3.02)2701
3750372 (2.11)2806365 (2.93)2614
3875361 (2.05)2719355 (2.58)2533
4000351 (1.99)2638345 (2.77)2457
4125341 (1.94)2562335 (2.69)2387
4250332 (1.89)2490326 (2.62)2320
4375323 (1.84)2423318 (2.55)2258
4500315 (1.80)2359310 (2.49)2198
4625308 (1.76)2297302 (2.43)2140
4750300 (1.72)2238295 (2.37)2085
4875293 (1.68)2180288 (2.32)2032
5000286 (1.64)2125281 (2.26)1980
5125279 (1.60)2070274 (2.21)1930
5250272 (1.56)2017267 (2.16)1881
537526 (1.53)1966261 (2.11)1833
5500259 (1.49)1916255 (2.06)1786
5625253 (1.46)1867248 (2.01)1740
5750247 (1.43)1820243 (1.96)1697
5875241 (1.40)1774237 (1.92)1654
6000236 (1.37)1731232 (1.88)1614
6125231 (1.34)1690227 (1.84)1577
6250226 (1.31)1653222 (1.80)1542
6375222 (1.29)1619218 (1.77)1510
6500218 (1.27)1590214 (1.74)1483
6625215 (1.25)1565211 (1.72)1460
6750213 (1.24)1546209 (1.70)1443
6875211 (1.23)1534207 (1.68)1432
7000211 (1.23)1530207 (1.68)1428
7125 Or More211 (1.22)1531206 (1.68)1428

U.S. EPA ASM EMISSION STANDARDS - 1984-87 LIGHT DUTY TRUCKS (6001 GVWR OR MORE)

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750390 (3.54)4990381 (4.85)4960
1875368 (3.34)4990359 (4.57)4738
2000348 (3.16)4778339 (4.31)4535
2125329 (2.99)4578321 (4.08)4349
2250312 (2.83)4395305 (3.86)4179
2375297 (2.69)4228290 (3.66)4024
2500283 (2.56)4076276 (3.48)3881
2625270 (2.44)3936263 (3.32)3752
2750258 (2.33)3809252 (3.17)3579
2875247 (2.23)3669241 (3.03)3417
3000237 (2.14)3510232 (2.91)3270
3125228 (2.06)3366223 (2.79)3135
3250220 (1.99)3234215 (2.69)3012
3375213 (1.92)3113208 (2.60)2899
3500206 (1.86)3002201 (2.51)2796
3625200 (1.80)2900195 (2.43)2701
3750194 (1.74)2806189 (2.36)2614
3875188 (1.69)2719184 (2.29)2533
4000183 (1.65)2638179 (2.22)2457
4125179 (1.61)2562175 (2.16)2387
4250174 (1.56)2490170 (2.11)2320
4375170 (1.53)2423166 (2.06)2258
4500166 (1.49)2359162 (2.01)2198
4625162 (1.46)2297159 (1.96)2140
4750159 (1.42)2238155 (1.91)2085
4875155 (1.39)2180152 (1.87)2032
5000152 (1.36)2125148 (1.82)1980
5125148 (1.33)2070145 (1.78)1930
5250145 (1.30)2017142 (1.74)1881
5375142 (1.27)1966139 (1.70)1833
5500139 (1.24)1916136 (1.66)1786
5625136 (1.12)1867133 (1.62)1740
5750133 (1.19)1820130 (1.59)1697
5875130 (1.16)1774127 (1.55)1654
6000127 (1.14)1731124 (1.52)1614
6125125 (1.11)1690122 (1.49)1577
6250123 (1.09)1653120 (1.46)1542
6375120 (1.07)1619118 (1.43)1510
6500119 (1.06)1590116 (1.41)1483
6625117 (1.04)1565114 (1.39)1460
6750116 (1.03)1546113 (1.37)1443
6875115 (1.02)1534113 (1.36)1432
7000115 (1.02)1530112 (1.36)1428
7125 Or More115 (1.02)1531112 (1.36)1428

U.S. EPA ASM EMISSION STANDARDS - 1988-90 LIGHT DUTY TRUCKS (6001 GVWR OR MORE)

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750390 (3.54)4084381 (4.85)4005
1875368 (3.34)4054359 (4.57)3767
2000348 (3.16)3824339 (4.31)3548
2125329 (2.99)3609321 (4.08)3348
2250312 (2.83)3411305 (3.86)3165
2375297 (2.69)3231290 (3.66)2998
2500283 (2.56)3066276 (3.48)2845
2625270 (2.44)2916263 (3.32)2706
2750258 (2.33)2779252 (3.17)2579
2875247 (2.23)2654241 (3.03)2463
3000237 (2.14)2539232 (2.91)2357
3125228 (2.06)2435223 (2.79)2260
3250220 (1.99)2340215 (2.69)2172
3375213 (1.92)2253208 (2.60)2092
3500206 (1.86)2174201 (2.51)2018
3625200 (1.80)2100195 (2.43)1950
3750194 (1.74)2033189 (2.36)1887
3875188 (1.69)1970184 (2.29)1829
4000183 (1.65)1912179 (2.22)1775
4125179 (1.61)1857175 (2.16)1724
4250174 (1.56)1806170 (2.11)1677
4375170 (1.53)1757166 (2.06)1632
4500166 (1.49)1711162 (2.01)1589
4625162 (1.46)1666159 (1.96)1548
4750159 (1.42)1624155 (1.91)1508
4875155 (1.39)1583152 (1.87)1470
5000152 (1.36)1542148 (1.82)1433
5125148 (1.33)1503145 (1.78)1397
5250145 (1.30)1465142 (1.74)1362
5375142 (1.27)1428139 (1.70)1327
5500139 (1.24)1392136 (1.66)1294
5625136 (1.12)1357133 (1.62)1261
5750133 (1.19)1323130 (1.59)1230
5875130 (1.16)1290127 (1.55)1199
6000127 (1.14)1259124 (1.52)1171
6125125 (1.11)1230122 (1.49)1144
6250123 (1.09)1203120 (1.46)1119
6375120 (1.07)1179118 (1.43)1096
6500119 (1.06)1158116 (1.41)1077
6625117 (1.04)1140114 (1.39)1060
6750116 (1.03)1127113 (1.37)1048
6875115 (1.02)1118113 (1.36)1040
7000 Or More115 (1.02)1115112 (1.36)1037

U.S. EPA ASM EMISSION STANDARDS - 1991-95 LIGHT DUTY TRUCKS (6001 GVWR OR MORE)

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750324 (2.78)3631315 (3.64)3532
1875306 (2.63)3586297 (3.43)3323
2000289 (2.48)3383281 (3.24)3131
2125274 (2.35)3192267 (3.06)2955
2250260 (2.23)3018253 (2.90)2794
2375247 (2.12)2859241 (2.76)2646
2500236 (2.02)2714230 (2.62)2512
2625225 (1.92)2581219 (2.50)2389
2750216 (1.84)2460210 (2.39)2277
2875207 (1.76)2350210 (2.29)2175
3000199 (1.69)2249194 (2.19)2082
3125191 (1.63)2157186 (2.11)1997
3250185 (1.57)2073180 (2.03)1920
3375179 (1.52)1997174 (1.96)1849
3500173 (1.47)1926169 (1.89)1784
3625168 (1.42)1862164 (1.84)1724
3750163 (1.38)1802159 (1.78)1669
3875159 (1.34)1747155 (1.73)1618
4000155 (1.31)1695151 (1.68)1570
4125151 (1.27)1647147 (1.64)1526
4250147 (1.24)1602143 (1.60)1484
4375144 (1.21)1559140 (1.56)1444
4500141 (1.18)1518137 (1.52)1406
4625137 (1.15)1479134 (1.48)1370
4750134 (1.13)1441131 (1.45)1336
4875132 (1.10)1405128 (1.42)1302
5000129 (1.08)1369126 (1.38)1269
5125126 (1.05)1335123 (1.35)1237
5250123 (1.03)1031120 (1.32)1206
5375121 (1.01)1269118 (1.29)1176
5500118 (0.99)1237115 (1.26)1147
5625116 (0.97)1206113 (1.24)1118
5750113 (0.94)1176111 (1.21)1090
5875111 (0.92)1147108 (1.18)1064
6000109 (0.91)1120106 (1.16)1039
6125107 (0.89)1094104 (1.13)1015
6250105 (.087)1070102 (1.11)993
6375103 (0.86)1049101 (1.09)973
6500102 (0.84)103099 (1.08)956
6625101 (0.83)101498 (1.06)941
6750100 (0.82)100397 (1.05)931
687599 (0.82)99597 (1.04)924
700099 (0.82)99296 (1.04)921
7125 Or More98 (0.81)99296 (1.04)921

U.S. EPA ASM EMISSION STANDARDS - 1994 + TIER 1 LIGHT DUTY TRUCKS (5750 LVW OR LESS)

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750224 (1.26)1819216 (1.22)1642
1875212 (1.19)1713205 (1.16)1547
2000201 (1.13)1616194 (1.09)1460
2125191 (1.07)1527184 (1.04)1380
2250182 (1.02)1446175 (0.99)1307
2375173 (0.97)1372167 (0.94)1240
2500166 (0.93)1304160 (0.90)1179
2625159 (0.89)1242153 (0.86)1123
2750152 (0.85)1186147 (0.82)1072
2875146 (0.82)1134141 (0.79)1026
3000141 (0.79)1088136 (0.76)984
3125136 (0.76)1045132 (0.73)945
3250132 (0.73)1006127 (0.71)910
3375128 (0.71)970123 (0.69)878
3500124 (0.69)937120 (0.67)848
3625120 (0.67)907117 (0.65)821
3750117 (0.65)879114 (0.63)796
3875114 (0.63)853111 (0.61)773
4000112 (0.62)829108 (0.60)751
4125109 (0.60)807106 (0.58)731
4250107 (0.59)786103 (0.57)712
4375104 (0.58)766101 (0.56)694
4500102 (0.57)74799 (0.55)677
4625100 (0.55)72897 (0.54)661
475098 (0.54)71195 (0.53)645
487596 (0.53)69493 (0.52)630
500094 (0.52)67792 (0.51)615
512593 (0.51)66190 (0.50)600
525091 (0.50)64688 (0.49)586
537589 (0.49)63186 (0.48)573
550087 (0.48)61685 (0.47)559
562586 (0.47)60183 (0.46)546
575084 (0.46)58782 (0.45)534
587583 (0.45)57480 (0.44)522
600081 (0.44)56179 (0.44)510
612580 (0.44)54978 (0.43)499
625079 (0.43)53876 (0.42)489
637577 (0.42)52875 (0.42)480
650076 (0.42)51974 (0.41)473
662576 (0.41)51274 (0.41)466
675075 (0.41)50773 (0.41)461
687575 (0.40)50373 (0.40)458
7000 Or More74 (0.40)50272 (0.40)457

U.S. EPA ASM EMISSION STANDARDS - 1994 + TIER 1 LIGHT DUTY TRUCKS (5751 LVW OR MORE)

Test WeightASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
1750324 (2.78)3178315 (3.64)3060
1875306 (2.63)3117297 (3.43)2879
2000289 (2.48)2941281 (3.24)2713
2125274 (2.35)2776267 (3.06)2561
2250260 (2.23)2625253 (2.90)2422
2375247 (2.12)2487241 (2.76)2295
2500236 (2.02)2361230 (2.62)2179
2625225 (1.92)2246219 (2.50)2073
2750216 (1.84)2142210 (2.39)1976
2875207 (1.76)2046210 (2.29)1888
3000199 (1.69)1959194 (2.19)1808
3125191 (1.63)1879186 (2.11)1734
3250185 (1.57)1806180 (2.03)1667
3375179 (1.52)1740174 (1.96)1606
3500173 (1.47)1679169 (1.89)1550
3625168 (1.42)1623164 (1.84)1498
3750163 (1.38)1571159 (1.78)1451
3875159 (1.34)1523155 (1.73)1407
4000155 (1.31)1479151 (1.68)1365
4125151 (1.27)1437147 (1.64)1327
4250147 (1.24)1398143 (1.60)1291
4375144 (1.21)1360140 (1.56)1257
4500141 (1.18)1325137 (1.52)1224
4625137 (1.15)1291134 (1.48)1193
4750134 (1.13)1259131 (1.45)1163
4875132 (1.10)1227128 (1.42)1134
5000129 (1.08)1196126 (1.38)1106
5125126 (1.05)1167123 (1.35)1078
5250123 (1.03)1138120 (1.32)1051
5375121 (1.01)1109118 (1.29)1025
5500118 (0.99)1082115 (1.26)1000
5625116 (0.97)1055113 (1.24)975
5750113 (0.94)1029111 (1.21)951
5875111 (0.92)1004108 (1.18)928
6000109 (0.91)980106 (1.16)906
6125107 (0.89)958104 (1.13)886
6250105 (.087)937102 (1.11)867
6375103 (0.86)919101 (1.09)850
6500102 (0.84)90299 (1.08)835
6625101 (0.83)88998 (1.06)823
6750100 (0.82)87997 (1.05)813
687599 (0.82)87297 (1.04)807
700099 (0.82)87096 (1.04)805
7125 Or More98 (0.81)87096 (1.04)805

U. S. EPA REVISED FINAL ASM EMISSION STANDARDS (ASM5015 & ASM2525)

NOTE:EPA has not published a revised final standards for High Altitude, Light Duty Trucks 2 (6000-8500 GVWR), or vehicles older than 1980 model year. EPA guidance as of February 2003 states that a program may choose to use combinations of the Original and the Revised Final Standards.

U.S. EPA REVISED FINAL ASM EMISSION STANDARDS

ApplicationASM5015ASM2525
HC ppm (CO %)NOx ppmHC ppm (CO %)NOx ppm
Passenger Cars
1980275 (1.3)8500500 (2.3)4750
1981-82275 (1.3)3600500 (2.3)3500
1983-89275 (1.1)3600500 (1.6)3500
1990 & Newer275 (1.1)3600300 (1.6)3500
Light Duty Trucks (Less Than 6000 GVWR)
1980-831140 (9.7)14,145340 (23.28)32,200
1984-87537 (5.4)14,145160 (12.96)32,200
1988-95537 (5.4)7380160 (12.96)16,800
1996 & Newer275 (1.1)615082 (4.40)14,000

U.S. EPA IM240 EMISSION STANDARDS

START-UP STANDARDS

Start-up standards should be used during the first 2 years of program operation. Tier 1 standards are recommended for all 1996 and newer vehicles and may be used for 1994 and newer vehicles certified to Tier 1 standards as well.

U.S. EPA IM240 HYDROCARBONS EMISSION START-UP STANDARDS

ApplicationHydrocarbons (Grams/Mile)
CompositePhase 2
Light Duty Vehicles
1996 & Newer0.800.50
1991-951.200.75
1983-902.001.25
1980-822.001.25
1975-797.505.00
1968-7410.06.00
High Altitude Light Duty Vehicles
1983-842.001.25
19822.001.25
Light Duty Trucks (0-6000 Lbs. GVWR)
1996 & Newer (Less Than 3750 LVW)0.800.50
1996 & Newer (More Than 3750 LVW)1.000.63
1991-952.401.50
1984-903.202.00
1979-837.505.00
1975-788.005.00
1968-7410.06.00
High Altitude Light Duty Trucks (0-6000 Lbs. GVWR)
1991 & Newer3.002.00
1984-904.002.50
1982-838.005.00
Light Duty Trucks (6001-8500 Lbs. GVWR)
1996 & Newer (Less Than 5750 ALVW)1.000.63
1996 & Newer (More Than 5750 ALVW)2.401.50
1991-952.401.50
1984-903.202.00
1979-837.505.00
1975-788.005.00
1968-7410.06.00
High Altitude Light Duty Trucks (6001-8500 Lbs. GVWR)
1991 & Newer3.002.00
1984-904.002.50
1982-838.005.00
Heavy Duty Trucks (Greater Than 8500 Lbs. GVWR)
1998 & Newer2.001.30
1987-973.001.90
1985-865.003.10
1979-846.003.80
1970-7810.06.30
1969 & Earlier20.012.50

U.S. EPA IM240 CARBON MONOXIDE EMISSION START-UP STANDARDS

ApplicationCarbon Monoxide (Grams/Mile)
CompositePhase 2
Light Duty Vehicles
1996 & Newer15.012.0
1991-9520.016.0
1983-9030.024.0
1980-8260.048.0
1975-7990.072.0
1968-74150.0120.0
High Altitude Light Duty Vehicles
1983-8460.048.0
198275.060.0
Light Duty Trucks (0-6000 Lbs. GVWR)
1996 & Newer (Less Than 3750 LVW)15.012.0
1996 & Newer (More Than 3750 LVW)20.016.0
1991-9560.048.0
1984-9080.064.0
1979-83100.080.0
1975-78120.096.0
1968-74150.0120.0
High Altitude Light Duty Trucks (0-6000 Lbs. GVWR)
1991 & Newer70.056.0
1984-9090.072.0
1982-83130.0104.0
Light Duty Trucks (6001-8500 Lbs. GVWR)
1996 & Newer (Less Than 5750 ALVW)20.016.0
1996 & Newer (More Than 5750 ALVW)60.048.0
1991-9560.048.0
1984-9080.064.0
1979-83100.080.0
1975-78120.096.0
1968-74150.0120.0
High Altitude Light Duty Trucks (6001-8500 Lbs. GVWR)
1991 & Newer70.056.0
1984-9090.072.0
1982-83130.0104.0
Heavy Duty Trucks (Greater Than 8500 Lbs. GVWR)
1998 & Newer30.024.0
1987-9760.048.0
1985-8675.060.0
1979-84100.080.0
1974-78150.00120.0
1970-73175.00140.00
1969 & Earlier200.0160.0

U.S. EPA IM240 OXIDES OF NITROGEN EMISSION START-UP STANDARDS

ApplicationOxides Of Nitrogen (Grams/Mile)
CompositePhase 2
Light Duty Vehicles
1996 & Newer2.02.0
1991-952.52.5
1981-903.03.0
1977-806.06.0
1973-769.09.0
1968-7210.010.0
High Altitude Light Duty Vehicles
1982-843.03.0
Light Duty Trucks (0-6000 Lbs. GVWR)
1996 & Newer (Less Than 3750 LVW)2.02.0
1996 & Newer (More Than 3750 LVW)2.52.5
1991-953.03.0
1988-903.53.5
1979-877.07.0
1973-789.09.0
1968-7210.010.0
High Altitude Light Duty Trucks (0-6000 Lbs. GVWR)
1991 & Newer3.03.0
1988-903.53.5
1982-877.07.0
Light Duty Trucks (6001-8500 Lbs. GVWR)
1996 & Newer (Less Than 5750 ALVW)2.52.5
1996 & Newer (More Than 5750 ALVW)4.04.0
1991-954.54.5
1988-905.05.0
1979-877.07.0
1973-789.09.0
1968-7210.010.0
High Altitude Light Duty Trucks (6001-8500 Lbs. GVWR)
1991 & Newer4.54.5
1988-905.05.0
1982-877.07.0
Heavy Duty Trucks (Greater Than 8500 Lbs. GVWR)
1998 & Newer4.04.0
1991-976.06.0
1979-908.08.0
1970-7810.010.0
1969 & Earlier15.015.0

FINAL STANDARDS

Final standards are recommended for vehicles tested in calendar years 1997 and later. Tier 1 standards are recommended for all 1996 and newer vehicles and may be used for 1994 and newer vehicles.

U.S. EPA IM240 HYDROCARBONS EMISSION FINAL STANDARDS

ApplicationHydrocarbons (Grams/Mile)
CompositePhase 2
Light Duty Vehicles
1996 & Newer0.600.40
1980-950.800.50
1975-793.002.00
1968-747.004.50
High Altitude Light Duty Vehicles
1982-841.200.75
Light Duty Trucks (0-6000 Lbs. GVWR)
1996 & Newer (Less Than 3750 LVW)0.600.40
1996 & Newer (More Than 3750 LVW)0.800.50
1984-951.601.00
1979-833.402.00
1975-784.002.50
1968-747.004.50
High Altitude Light Duty Trucks (0-6000 Lbs. GVWR)
1988 & Newer2.001.25
1984-872.001.25
1982-834.002.50
Light Duty Trucks (6001-8500 Lbs. GVWR)
1996 & Newer (Less Than 5750 ALVW)0.800.50
1996 & Newer (More Than 5750 ALVW)0.800.50
1984-951.601.00
1979-833.402.00
1975-784.002.50
1968-747.004.50
High Altitude Light Duty Trucks (6001-8500 Lbs. GVWR)
1988 & Newer2.001.25
1984-872.001.25
1982-834.002.50
Heavy Duty Trucks (Greater Than 8500 Lbs. GVWR)
1998 & Newer2.001.30
1987-972.001.30
1985-863.001.90
1979-845.003.10
1970-7810.06.30
1969 & Earlier20.012.50

U.S. EPA IM240 CARBON MONOXIDE EMISSION FINAL STANDARDS

ApplicationCarbon Monoxide (Grams/Mile)
CompositePhase 2
Light Duty Vehicles
1996 & Newer10.08.0
1983-9515.012.0
1980-8230.024.0
1975-7965.052.0
1968-74120.096.0
High Altitude Light Duty Vehicles
1983-8430.024.0
198245.036.0
Light Duty Trucks (0-6000 Lbs. GVWR)
1996 & Newer (Less Than 3750 LVW)10.08.0
1996 & Newer (More Than 3750 LVW)13.010.0
1984-9540.032.0
1979-8370.056.0
1975-7880.064.0
1968-74120.096.0
High Altitude Light Duty Trucks (0-6000 Lbs. GVWR)
1988 & Newer60.048.0
1984-8760.048.0
1982-8390.072.0
Light Duty Trucks (6001-8500 Lbs. GVWR)
1996 & Newer (Less Than 5750 ALVW)13.010.0
1996 & Newer (More Than 5750 ALVW)15.012.0
1984-9540.032.0
1979-8370.056.0
1975-7880.064.0
1968-74120.096.0
High Altitude Light Duty Trucks (6001-8500 Lbs. GVWR)
1984 & Newer60.048.0
1982-8390.072.0
Heavy Duty Trucks (Greater Than 8500 Lbs. GVWR)
1998 & Newer30.024.0
1987-9740.032.0
1985-8650.040.0
1979-8475.060.0
1974-78150.0120.0
1970-73175.0140.0
1969 & Earlier200.0160.0

U.S. EPA IM240 OXIDES OF NITROGEN EMISSION FINAL STANDARDS

ApplicationOxides Of Nitrogen (Grams/Mile)
CompositePhase 2
Light Duty Vehicles
1996 & Newer1.51.5
1981-952.02.0
1977-804.04.0
1973-766.06.0
1968-727.07.0
High Altitude Light Duty Vehicles
1982-842.02.0
Light Duty Trucks (0-6000 Lbs. GVWR)
1996 & Newer (Less Than 3750 LVW)1.51.5
1996 & Newer (More Than 3750 LVW)1.81.8
1988-952.52.5
1979-874.54.5
1973-786.06.0
1968-727.07.0
High Altitude Light Duty Trucks (0-6000 Lbs. GVWR)
1988 & Newer2.52.5
1982-874.54.5
Light Duty Trucks (6001-8500 Lbs. GVWR)
1996 & Newer (Less Than 5750 ALVW)1.81.8
1996 & Newer (More Than 5750 ALVW)2.02.0
1988-953.53.5
1979-874.54.5
1973-786.06.0
1968-727.07.0
High Altitude Light Duty Trucks (6001-8500 Lbs. GVWR)
1988 & Newer3.53.5
1982-874.54.5
Heavy Duty Trucks (Greater Than 8500 Lbs. GVWR)
1998 & Newer4.04.0
1991-975.05.0
1979-906.06.0
1970-7810.010.0
1969 & Earlier15.015.0

GENERAL INFORMATION State Emission Standards (2024)
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