State Emission Testing
This section requires expansion. |
Name | Light duty gasoline | Emissions testing | Light-duty diesel | Emissions testing | Heavy-duty diesel | Emissions testing | Special notes |
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Alabama | No emissions testing required | No emissions testing required | Alabama maintains "volunteer emission testing" | ||||
Alaska | ≥6 model years old (Anchorage) | Every two years | Exempt | Exempt | |||
Arizona | Model Years ≥1967 but more than 5 model years old (Pima County/ Maricopa County) | Every two years | 1967–2007 (Pima County/ Maricopa County) | Pima County: 30 percent opacity
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Maricopa County | J1667 test protocol
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Arkansas | |||||||
California | Model Years 1976 and newer. New cars are exempt until 6 years old. Hybrid vehicles are exempt. | Every two years | |||||
Colorado | |||||||
Connecticut | more than 4 model years old but less than 25 model years old | Every two years (OBDII) | more than 4 model years old but less than 25 model years old | Every two years | Exempt | ||
Delaware | Over 5 model years old | Every two years (OBDII) | |||||
Florida | |||||||
Georgia | Annually (Atlanta metro area only) | ||||||
Hawaii | |||||||
Idaho | |||||||
Illinois | Every two years | ||||||
Indiana | |||||||
Iowa | |||||||
Kansas | |||||||
Kentucky | |||||||
Louisiana | |||||||
Maine | |||||||
Maryland | Hybrid vehicles that achieve an EPA gas mileage rating of at least 50 miles per gallon are exempt from testing for 3 years after their model year, after which they are then tested at the standard two year intervals. | Every two years | |||||
Massachusetts | Every year | OBDII | Every year | OBDII | 8,501 to 14,000 lbs (Medium duty)
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Medium Duty: OBDII
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Michigan | |||||||
Minnesota | |||||||
Mississippi | |||||||
Missouri | |||||||
Montana | |||||||
Nebraska | |||||||
Nevada | |||||||
New Hampshire | |||||||
New Jersey | |||||||
New Mexico | Model Years ≥1978 but more than 4 model years old (Bernalillo County) | Every two years and at change of ownership | Model Years ≥1978 but more than 4 model years old (Bernalillo County) | Every two years and at change of ownership | Exempt | ||
New York | |||||||
North Carolina | |||||||
North Dakota | |||||||
Ohio | |||||||
Oklahoma | |||||||
Oregon | |||||||
Pennsylvania | |||||||
Rhode Island | more than 2 models years old (inclusive) or 24,000 miles (inclusive) | Every two years (OBDII) | Exempt | Exempt | Effective July 2012, any state contracted job requiring heavy duty vehicles must be operated with pollution control devices | ||
South Carolina | |||||||
South Dakota | |||||||
Tennessee | |||||||
Texas | more than 2 model years old to 24 model years old | annually (both OBDII for 1996–present and ASM to 1995 for motor vehicles except for 4-wheel drive/all wheel drive powertrains (4WD/AWD including vehicles over 8500 GVW are subjected to the two-speed idle (TSI) testing; TSI testing to 1995 only in El Paso, Travis, and Williamson Counties) | Emission testing mandated for motor vehicles registered in Brazoria, Fort Bend, Galveston, Harris, Montgomery, Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant, Travis, Williamson and El Paso counties | ||||
Utah | |||||||
Virginia | more than 2 model years old to 24 model years old | Every two years. First-time registrations exempt if vehicle has received an emissions certificate from certain states within previous 12 months. | newer than 1996 model year | every two years | GVWR > 8500 lbs. exempt | Emission testing mandated for motor vehicles registered in the counties of Arlington, Fairfax, Loudoun, Prince William, or Stafford, and the cities of Alexandria, Fairfax, Falls Church, Manassas or Manassas Park. Certain hybrids exempt. | |
Washington | |||||||
West Virginia | |||||||
Wisconsin | |||||||
Wyoming |
Read more about this topic: United States Emission Standards
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