Smog check stations, also known as vehicle emissions testing centers, are licensed facilities that ensure cars and trucks meet state environmental standards. In many states across the U.S., completing a smog check is a legal requirement for vehicle registration or renewal. These inspections help reduce air pollution, protect public health, and keep vehicles in compliance with Department of Motor Vehicles (DMV) regulations.

SmogCheckStations.org makes it easy to locate certified testing centers near you. Our directory provides up-to-date information on addresses, operating hours, and available services in every state where emissions testing is required. Whether you are applying for registration for the first time or simply need to renew, finding a reliable smog check station is essential for a smooth process and peace of mind.

Select your state to see a complete list of licensed facilities and plan your visit with accurate details, saving time and avoiding unexpected delays.

Frequently Asked Questions About Smog Checks

What is a smog check?

A smog check is an inspection of your vehicle’s emissions system to ensure it meets state air quality standards. Certified stations measure exhaust gases and provide a certificate required for DMV registration or renewal.

How often do I need an emissions test?

The frequency depends on state law. In many states, most vehicles must be tested every 1–2 years before registration renewal. Some states exempt newer vehicles for the first few years.

What happens if my car fails the smog check?

If your vehicle does not pass, the technician will give you a report explaining why. You’ll need to make the necessary repairs and return for a retest before you can renew your registration.

Can I renew my registration at the smog check station?

Most stations only perform inspections and issue certificates. Registration renewals are usually handled directly with the DMV, though some facilities may be integrated with DMV services depending on the state.

Smog Check Requirements by State

State	Testing Frequency	Notes
California	Every 2 years	Required statewide for most vehicles. Exemptions for new cars under 8 years old.
Arizona	Every 1–2 years	Applies mainly to Phoenix and Tucson metro areas.
Colorado	Every 1–2 years	Required in Denver-Boulder and surrounding counties.
Connecticut	Every 2 years	Most vehicles 4–10 years old. Hybrid/electric exempt.
Delaware	Every 2 years	Conducted with safety inspection at DMV facilities.
Georgia	Annual	Applies in 13 metro Atlanta counties only.
Illinois	Every 2 years	Required in Chicago and surrounding metro counties.
Indiana	Every 2 years	Applies in Lake and Porter counties near Chicago.
Maryland	Every 2 years	Required statewide; first test after 3 years.
Massachusetts	Annual	Emissions test included with yearly safety inspection.
Nevada	Every year or 2 years	Applies mainly in Clark and Washoe counties (Las Vegas, Reno).
New Jersey	Every 2 years	Gasoline vehicles 5–25 years old; safety inspection not required.
New Mexico	Every 2 years	Applies to Albuquerque metro area only.
New York	Annual	Part of the yearly safety inspection at certified shops.
North Carolina	Annual	Required in 19 urban counties; combined with safety inspection.
Ohio	Every 2 years	Applies only in 7 counties around Cleveland.
Oregon	Every 2 years	Applies in Portland and Medford metro areas.
Pennsylvania	Annual	Required in 25 counties; done with yearly safety inspection.
Rhode Island	Every 2 years	Gasoline vehicles under 25 years old; combined with safety test.
Tennessee	Annual (phasing out)	Some counties have ended requirements; check local DMV.
Texas	Annual	Required in 17 metro counties; combined with safety inspection.
Utah	Every 2 years	Applies mainly in urban counties like Salt Lake, Davis, and Utah County.
Virginia	Annual	Northern Virginia counties only; part of annual safety inspection.
Washington, D.C.	Every 2 years	All registered vehicles must pass emissions testing.
Wisconsin	Every 2 years	Required in Milwaukee and surrounding counties.

*Testing rules can change by county or over time. Always confirm current requirements with your state DMV or environmental agency.

Find Smog Check Stations and Emissions Testing Locations Across the U.S.

Find Certified Smog Check Stations in the United States