Vehicle Emissions Inspection by State (2026)

Last updated: May 7, 2026

As of 2026, 33 states plus DC require some form of vehicle emissions inspection before you can register or renew a registration, but in most of those states the requirement applies only to drivers in specific metro counties — not statewide. Seventeen states have no emissions program at all. Costs run $20 to $90, with the modal price between $25 and $40. Most states exempt vehicles 25 years and older (or those built before 1976), and battery-electric vehicles are universally exempt because they have no tailpipe to test. If your car fails, several states cap your repair obligation: California's Consumer Assistance Program reimburses up to $1,200 in qualifying repairs to help low-income drivers get back on the road.

Which states require an emissions inspection?

The federal Clean Air Act delegates emissions enforcement to states based on EPA-designated nonattainment areas — places where air quality fails federal ozone or particulate standards. That is why so few state programs are statewide. The dirty-air zones are usually one or two metro regions, and the rest of the state is left alone.

The 33 states with active 2026 programs are Arizona, California, Colorado, Connecticut, Delaware, Georgia, Idaho, Illinois, Indiana, Louisiana, Maine, Maryland, Massachusetts, Missouri, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, Ohio, Oregon, Pennsylvania, Rhode Island, Tennessee, Texas, Utah, Vermont, Virginia, Washington, Wisconsin, plus DC. Massachusetts, New York, Vermont, New Jersey, Maine, New Hampshire, Rhode Island, Connecticut, and Delaware run statewide programs that combine safety and emissions checks. Almost every other state limits the test to designated counties.

2026 state emissions inspection requirements

The biggest state programs in detail

California Smog Check. California is the largest emissions program in the country. Every county is covered except six rural northern counties (Alpine, El Dorado portions, Mono, Plumas, Sierra, Tehama, Trinity, parts of Riverside and San Bernardino). Smog Checks run on a biennial cycle for vehicles 1976 and newer that are at least eight model-years old. Fees vary by station ($50-$90) plus a $8.25 certificate fee. Diesel vehicles with a GVWR of 14,000 lb or less were folded into the Smog Check program in 2010.

Texas. Seventeen counties — including Harris, Dallas, Tarrant, Travis, El Paso, and Bexar — require both a safety inspection and an OBD-II emissions check. The combined fee is $25.50 in metro counties and $11.50 in non-emissions counties. As of January 2025, Texas eliminated the safety-inspection portion of the test for non-commercial vehicles statewide, but emissions testing in the 17 covered metros continues.

New York. NY operates a statewide combined program. Every gasoline-powered vehicle gets an annual OBD-II check (for 1996 and newer cars) or a low-enhanced tailpipe test (older vehicles). The combined safety + emissions fee maxes at $37 in the NYC metro and $27 elsewhere.

Massachusetts. Statewide annual combined safety + emissions program. Every gas vehicle gets an OBD-II check; pre-1996 vehicles get a two-speed idle tailpipe test. The flat fee is $35.

Virginia. Virginia's emissions program applies only to Northern Virginia — Arlington, Fairfax, Loudoun, Prince William, and Stafford counties plus the cities of Alexandria, Fairfax, Falls Church, Manassas, and Manassas Park. The biennial OBD-II test costs $28. The rest of Virginia has no emissions requirement.

Arizona. Maricopa County (Phoenix) and Pima County (Tucson) require emissions tests; the rest of Arizona is exempt. Test type depends on vehicle age and weight: gasoline cars 1996 and newer get OBD-II, older vehicles get an idle or loaded-mode tailpipe test.

Illinois. Chicago metro and the East St. Louis metro require biennial OBD-II testing through state-run Air Team stations. There is no fee paid at the station — the cost is built into your registration. Vehicles 1996 and newer that are at least four model-years old are subject.

Missouri. Five St. Louis metro counties — Franklin, Jefferson, St. Charles, St. Louis County, and the City of St. Louis — require biennial Gateway Vehicle Inspection Program testing at $24. The rest of Missouri is exempt.

Ohio. The E-Check program covers seven northeast Ohio counties — Cuyahoga, Geauga, Lake, Lorain, Medina, Portage, and Summit. Testing is biennial, free, and required only for gas vehicles 1996 and newer that are at least four model-years old.

Pennsylvania. Twenty-five of 67 counties require emissions testing in addition to the statewide annual safety inspection. The seven Philadelphia and Pittsburgh metro counties get full OBD-II testing; the remaining 18 counties get a visual gas-cap-only check.

OBD-II vs tailpipe test: what's the difference?

An OBD-II test is a 30-second software check. The technician plugs a scanner into your car's OBD-II port (located under the dashboard near the steering column), and the scanner reads the engine computer's stored emissions data. If your check-engine light is off and no readiness monitors are incomplete, you pass. Every gasoline vehicle built for sale in the US since model year 1996 has OBD-II, which is why almost every state has migrated to this method.

A tailpipe test physically samples your exhaust gas while the car is running on a dynamometer (rolling-road treadmill) or at idle. The test measures hydrocarbons, carbon monoxide, and oxides of nitrogen against the cutpoints set for your vehicle's weight and model year. Tailpipe tests are still used for pre-1996 vehicles and, in some states like California and Nevada, for diesels and heavy-duty trucks.

Age exemptions: how old does a car have to be?

Most state programs exempt vehicles 25 model-years old or older (the "rolling 25-year" exemption used in California, Texas, Pennsylvania, and others) on the theory that they make up a tiny fraction of the fleet and were built before modern emissions hardware existed. A handful of states use a fixed pre-1976 cutoff (Arizona, Connecticut, North Carolina) — anything built in 1975 or earlier is permanently exempt regardless of how many calendar years pass.

Some states also exempt brand-new vehicles for the first 4-6 model years to avoid testing cars that haven't yet had time to develop emissions faults. Illinois, Ohio, Wisconsin, and Indiana all exempt vehicles less than 4 model years old.

EV exemptions

Every state with an emissions program exempts battery-electric vehicles. They have no tailpipe and no internal combustion engine, so there is nothing to measure. Most states extend the exemption to plug-in hybrids during the period the vehicle is operating on battery power, but PHEVs still get an OBD-II check because they retain a gasoline engine. Hydrogen fuel cell vehicles are also universally exempt. Note that EV owners still pay the state's EV registration surcharge, which is a separate program.

Diesel rules

Diesels live in a gray zone. California, Connecticut, Maine, Massachusetts, New Jersey, New York, Pennsylvania, Rhode Island, Texas, and Utah include light-duty diesels (under 14,000 lb GVWR) in their inspection programs and apply OBD-II testing for 1998 and newer engines. Heavy-duty diesels are inspected separately under each state's commercial vehicle program. Many states still exempt all diesels from passenger emissions testing — including Arizona, Colorado (light-duty exempt), Georgia, Illinois, Missouri, Nevada (some counties), Ohio, Virginia, and Wisconsin.

What to do if your car fails

A failed inspection is not the end of the road. You typically have 30-60 days to make repairs and re-test. The repair shop will print a detailed failure code printout — bring it to your mechanic.

California Consumer Assistance Program (CAP). If you fail a Smog Check in California and meet income limits (currently $46,000-$60,000 depending on household size, set at 225% of federal poverty), CAP will reimburse up to $1,200 in qualifying emissions-related repairs at a state-licensed Gold Shield STAR station. If repairs exceed $1,200 — or if your vehicle is not cost-effective to repair — CAP also offers a vehicle retirement option that pays $1,000-$1,500 to scrap the car.

Repair waivers. Most states will issue a one-cycle waiver if you can document that you spent at least a state-set minimum (typically $200-$450) on emissions-related repairs at a licensed shop and the vehicle still fails. Texas, Pennsylvania, Virginia, and Massachusetts all have waiver programs. The waiver is good for one inspection cycle only — you'll have to fix the car or sell it before the next renewal.

Hardship extensions. If you are in active repair but can't finish before your registration deadline, most state DMVs will issue a 30-90 day temporary registration. Bring the failed inspection report and proof you've started repairs.

How to prepare

The best advice is simple: keep your check-engine light off. The single most common reason cars fail OBD-II testing is a stored fault code or an illuminated MIL (Malfunction Indicator Lamp). Disconnecting the battery to clear codes shortly before testing actually causes a fail because it resets the readiness monitors, and most states won't pass a vehicle until 5-7 monitors have completed. Drive normally for at least a week after any battery work before testing. For more pre-test tips see our how to pass vehicle inspection walkthrough.

Related: safety inspection rules

Sixteen states require a separate annual or biennial safety inspection that checks brakes, lights, tires, and steering — independent of any emissions program. Some states (NY, MA, VA, PA, NH, NJ) combine the two into a single appointment; others run them separately. See our companion guide safety inspection by state for the full breakdown.

Save on auto insurance while you're at it

An expiring inspection sticker is also a good reminder to re-shop your insurance. Three options:

Sources

• EPA Vehicle Emissions State I/M Programs
• California Bureau of Automotive Repair Smog Check Program
• California Consumer Assistance Program (CAP)
• Texas DMV Vehicle Inspections
• New York DMV Inspection Program
• Virginia DMV