Which states have no emissions testing at all?

Alabama, Alaska, Arkansas, Florida, Hawaii, Iowa, Kansas, Kentucky, Michigan, Minnesota, Mississippi, Montana, Nebraska, North Dakota, Oklahoma, South Carolina, South Dakota, Tennessee, Washington, West Virginia and Wyoming have no vehicle emissions testing program. Several others test only in specific counties, so a car that cannot pass in one county may be perfectly registerable in another county of the same state.

Can I register a car in a no-test state if I live somewhere else?

No. Registration follows where you actually live, not where the car came from. Moving a car to a non-testing area only helps if the buyer genuinely lives and registers there.

Does a car become exempt once it is old enough?

Usually yes, but the cutoff varies a lot. Texas exempts vehicles 25 model years and older, Georgia uses 25 years, North Carolina uses 20, and California exempts 1975 and older with no rolling cutoff. Always check the current rule in your state.

Are diesel trucks treated differently?

Often. Several states exempt diesels entirely, exempt them above a certain weight rating, or test them with an opacity test instead of an OBD scan. Heavy-duty diesel rules also differ from passenger car rules in the same state.

Is it legal to sell a car that cannot pass emissions?

In most states yes, provided you disclose the vehicle's condition honestly and follow your state's rules on smog certificates at transfer. Some states require the seller to supply a passing certificate; others allow as-is sales with disclosure. Removing or disabling federally required emissions equipment remains illegal under federal law regardless of where the vehicle is registered.

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Emissions

Emissions testing by state

21 states run no vehicle emissions testing at all. 20 more test only in certain counties or metro areas, and 10 test just about everywhere. Find your state below, or the state you are thinking of selling into.

Find a state

State	Testing	Where it applies	Notes
Alabama	No testing	Nowhere	No emissions or safety inspection program.
Alaska	No testing	Nowhere	Anchorage and Mat-Su testing ended in 2011.
Arizona	Certain areas	Phoenix and Tucson metro areas	Rural counties are outside the program. Older vehicles and some newer ones are exempt.
Arkansas	No testing	Nowhere	No emissions testing program.
California	Statewide	Nearly the whole state	A handful of rural ZIP codes test only on change of ownership. 1975 and older, and vehicles under 8 model years old, are generally exempt.
Colorado	Certain areas	Denver metro and North Front Range	Vehicles 7 model years old and newer are generally exempt; 1981 and older follow separate rules.
Connecticut	Statewide	Statewide	Every two years. Vehicles 1996 and older, and the newest model years, are exempt.
Delaware	Statewide	Statewide	New vehicles are exempt for their first several years.
District of Columbia	Statewide	Districtwide	Biennial testing for most gasoline vehicles.
Florida	No testing	Nowhere	Testing ended statewide in 2000.
Georgia	Certain areas	13 metro Atlanta counties	The three newest model years and vehicles 25 years and older are generally exempt.
Hawaii	No testing	Nowhere	Safety inspection only, no tailpipe or OBD emissions test.
Idaho	Certain areas	Boise area (Ada County)	Canyon County testing ended. Most of the state has no program.
Illinois	Certain areas	Chicago area and the Metro East (St. Louis) area	1995 and older vehicles are exempt; newer vehicles start testing after several years.
Indiana	Certain areas	Lake and Porter counties only	The rest of the state has no emissions program.
Iowa	No testing	Nowhere	No emissions testing program.
Kansas	No testing	Nowhere	No emissions testing program.
Kentucky	No testing	Nowhere	Louisville-area testing ended in 2005.
Louisiana	Certain areas	Five Baton Rouge-area parishes	Most parishes require a safety inspection only.
Maine	Certain areas	Cumberland County (Portland area)	The rest of the state has safety inspection without an emissions test.
Maryland	Certain areas	Most populated counties plus Baltimore City	Vehicles model year 1976 and older, and the newest vehicles, are generally exempt.
Massachusetts	Statewide	Statewide	Annual safety plus OBD emissions test for most 1996 and newer vehicles.
Michigan	No testing	Nowhere	No emissions testing program.
Minnesota	No testing	Nowhere	Testing ended in 1999.
Mississippi	No testing	Nowhere	No emissions testing program.
Missouri	Certain areas	St. Louis City and surrounding counties	The rest of the state has no emissions test.
Montana	No testing	Nowhere	No emissions testing program.
Nebraska	No testing	Nowhere	No emissions testing program.
Nevada	Certain areas	Urban Clark County (Las Vegas) and Washoe County (Reno)	Rural counties are exempt. 1967 and older vehicles are generally exempt, as are diesels over a set weight.
New Hampshire	Statewide	Statewide	Annual OBD check bundled with the safety inspection for 1996 and newer vehicles.
New Jersey	Statewide	Statewide	Every two years. Vehicles under 5 model years old and most pre-1996 vehicles are exempt.
New Mexico	Certain areas	Bernalillo County (Albuquerque)	No emissions testing elsewhere in the state.
New York	Statewide	Statewide	Annual. New York City metro counties use a stricter program; 1996 and newer get an OBD test.
North Carolina	Certain areas	A shrinking list of about 19 counties	The county list has been reduced repeatedly. Vehicles over 20 model years old are exempt.
North Dakota	No testing	Nowhere	No emissions testing program.
Ohio	Certain areas	Seven Cleveland-area counties (E-Check)	The rest of the state has no emissions test.
Oklahoma	No testing	Nowhere	No emissions or safety inspection program.
Oregon	Certain areas	Portland metro and the Medford area	Vehicles 1975 and older are exempt, and the newest model years are typically exempt.
Pennsylvania	Certain areas	About 25 of 67 counties	Mostly the metro and higher-population counties; rural counties are safety-inspection only.
Rhode Island	Statewide	Statewide	Every two years, combined with safety inspection. New vehicles are exempt for their first years.
South Carolina	No testing	Nowhere	No emissions or safety inspection program.
South Dakota	No testing	Nowhere	No emissions testing program.
Tennessee	No testing	Nowhere	Statewide vehicle emissions testing ended in January 2022.
Texas	Certain areas	17 counties around the major metros	Vehicles 2 to 24 model years old are tested in covered counties; 25 years and older are exempt.
Utah	Certain areas	Cache, Davis, Salt Lake, Utah and Weber counties	Requirements and intervals vary by county. Older vehicles are generally exempt.
Vermont	Statewide	Statewide	Annual OBD check as part of the safety inspection for 1996 and newer vehicles.
Virginia	Certain areas	Northern Virginia (DC suburbs)	The rest of the state requires safety inspection only.
Washington	No testing	Nowhere	Emissions testing ended statewide on January 1, 2020.
West Virginia	No testing	Nowhere	Safety inspection only.
Wisconsin	Certain areas	Seven southeastern counties	1995 and older vehicles and diesels are generally exempt.
Wyoming	No testing	Nowhere	No emissions testing program.

Programs, county lists and exemption ages change. Treat this as a starting point and confirm the current rule with the state DMV or environmental agency before you buy, sell or register.

What this means if your car won't pass

The same vehicle can be a registration headache in one county and completely ordinary an hour's drive away. That gap is why a truck that fails in Sacramento is worth more to a buyer in Nevada's rural counties, or in a state with no program at all.

What matters is where the buyer registers the vehicle, not where it currently sits. Selling into a non-testing area is a normal private-party sale: you disclose the vehicle's condition honestly, follow your own state's rules about certificates at transfer, and the buyer registers it where they live.

Condition is its own draw. California and other Sunbelt cars avoid winter road salt, so the bodies and undercarriages stay cleaner than anything local in the rust belt. A car that can't pass in California is still a clean-body car to a buyer whose options are rusted through.

Federal law is separate from state testing. Removing or disabling emissions equipment that a vehicle was built with is illegal under the Clean Air Act everywhere in the US, regardless of whether the buyer's county tests. A state with no test is not a state with no rules.

Common questions

Which states have no emissions testing at all?: Alabama, Alaska, Arkansas, Florida, Hawaii, Iowa, Kansas, Kentucky, Michigan, Minnesota, Mississippi, Montana, Nebraska, North Dakota, Oklahoma, South Carolina, South Dakota, Tennessee, Washington, West Virginia and Wyoming have no vehicle emissions testing program. Several others test only in specific counties, so a car that cannot pass in one county may be perfectly registerable in another county of the same state.
Can I register a car in a no-test state if I live somewhere else?: No. Registration follows where you actually live, not where the car came from. Moving a car to a non-testing area only helps if the buyer genuinely lives and registers there.
Does a car become exempt once it is old enough?: Usually yes, but the cutoff varies a lot. Texas exempts vehicles 25 model years and older, Georgia uses 25 years, North Carolina uses 20, and California exempts 1975 and older with no rolling cutoff. Always check the current rule in your state.
Are diesel trucks treated differently?: Often. Several states exempt diesels entirely, exempt them above a certain weight rating, or test them with an opacity test instead of an OBD scan. Heavy-duty diesel rules also differ from passenger car rules in the same state.
Is it legal to sell a car that cannot pass emissions?: In most states yes, provided you disclose the vehicle's condition honestly and follow your state's rules on smog certificates at transfer. Some states require the seller to supply a passing certificate; others allow as-is sales with disclosure. Removing or disabling federally required emissions equipment remains illegal under federal law regardless of where the vehicle is registered.

Selling into a state where it's legal

Unsmoggables lists vehicles by where they are and where they can be sold, so buyers in non-testing areas can find them. Listing is free, and payment and title transfer happen directly between you and the buyer.

List your car →Browse listings What to do after a failed smog check

This guide is general information, not legal advice. Emissions and registration requirements are set by each state and change over time.