United States Emission Standards - State Emission Testing

State Emission Testing

This section requires expansion.
State Emissions
Name Light duty gasoline Emissions testing Light-duty diesel Emissions testing Heavy-duty diesel Emissions testing Special notes
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


Maricopa County: 20 percent opacity

 Maricopa County J1667 test protocol


Model year <1991: 55 percent opacity
Model year ≥1991: 40 percent opacity
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)


14,000 lbs+ (Heavy duty)

 Medium Duty: OBDII


Heavy duty: J1667 Protocol
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

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