California's smog exemption is based on your vehicle's model year, not its condition

A smog exempt year in California refers to a model year old enough that the state no longer requires a smog check before you can register or renew registration. The cutoff changes each year. As of 2024, vehicles model year 1975 and older are exempt from smog testing statewide. Vehicles model year 1976 through 1999 may be exempt depending on the county you live in and whether you have a diesel or gasoline engine.

The exemption is automatic based on your vehicle's age — you do not need to request it or prove anything about how well your car runs. When you register at the Department of Motor Vehicles (DMV), the system checks your vehicle's model year against the current exemption threshold. If your vehicle falls below that threshold, no smog certificate is required.

This is different from a smog waiver, which is a separate document you can obtain if your vehicle fails the test. An exemption means you skip the test entirely.

Key Takeaways

  • Vehicles model year 1975 and older are exempt from smog testing throughout California, regardless of where you live or what condition they are in.
  • Vehicles model year 1976 through 1999 may be exempt depending on your county and whether your engine is diesel or gasoline.
  • The exemption threshold moves forward by one year each January, so a vehicle exempt this year may not be exempt next year.
  • You do not need to explore for or request an exemption; the DMV checks your model year automatically during registration.
  • An exemption is different from a waiver — an exemption skips the test, while a waiver lets you register after a failed test.

How the exemption threshold works and when it changes

California moves the smog exemption cutoff forward by one model year every January 1st. This means that each year, vehicles one year older become exempt. The state does this to keep the exemption pool at roughly 30 years of vehicles, balancing the goal of reducing emissions from newer cars against the practical reality that very old vehicles are rare on the road.

The exemption applies to all vehicles of that model year and older, regardless of mileage, condition, or how often you drive. A 1975 model year vehicle with 200,000 miles and a 1975 model year vehicle with 5,000 miles are treated the same way.

You can find the current exemption threshold on the California Air Resources Board (CARB) website or by calling your local DMV. Because the threshold changes on a fixed date, you can plan ahead if your vehicle is close to the cutoff.

County-by-county variation for vehicles model year 1976 to 1999

California does not have a single smog testing program statewide. Instead, the state is divided into air quality regions, and some counties have stricter rules than others. For vehicles model year 1976 through 1999, whether you need a smog test depends on which county you register in.

Counties in the South Coast Air Quality Management District (SCAQMD) — which includes Los Angeles, Orange County, San Diego, and parts of Ventura and San Bernardino counties — have their own exemption rules that may differ from the statewide baseline. The Bay Area Air Quality Management District (BAAQMD) and San Joaquin Valley Air Pollution Control District also set their own thresholds.

Diesel vehicles are treated differently from gasoline vehicles in many counties. A diesel vehicle model year 1999 might require a test in one county while a gasoline vehicle of the same year does not. Check your specific county's rules before you register, because the DMV will know which rule applies to your address.

What happens if your vehicle is close to the exemption cutoff

If your vehicle is model year 2000 or newer, you will need a smog certificate in nearly all California counties. The only exceptions are electric vehicles, which are exempt from smog testing statewide regardless of model year, and some hybrid vehicles depending on when they were made.

If your vehicle is model year 1976 through 1999, contact your county's air quality management district or call the DMV before you register. They can tell you in minutes whether your specific vehicle and model year are exempt in your county. This is faster and more reliable than guessing based on general information.

If you are unsure and you register without a smog certificate when one was required, the DMV will reject your registration and you will have to obtain the certificate and resubmit. This delays your registration by several weeks.

Smog exemption versus smog waiver

An exemption means you do not take the test at all. A waiver means you took the test, failed it, and the state allows you to register anyway under specific conditions.

You can obtain a smog waiver if your vehicle fails the test but the repair cost would exceed a certain threshold (usually $500 to $800, depending on the vehicle's age and value). You must attempt repairs first, then get a second test. If it still fails and repairs would cost too much, you can explore for a waiver at the smog station or through the Bureau of Automotive Repair.

A waiver is temporary — it usually lasts two years, and you may need to test again when you renew registration. An exemption is permanent for that vehicle as long as it remains in that model year category.

Electric and alternative-fuel vehicles

Electric vehicles (EVs) are exempt from smog testing statewide, regardless of model year. This includes battery electric vehicles (BEVs) and plug-in hybrid electric vehicles (PHEVs). The exemption applies because these vehicles produce zero tailpipe emissions or significantly lower emissions than gasoline-only vehicles.

Some hydrogen fuel cell vehicles are also exempt. Vehicles that run on compressed natural gas (CNG) or liquefied petroleum gas (LPG) may be exempt depending on their model year and the county you live in.

If you own an alternative-fuel vehicle, check with your county's air quality district to confirm your vehicle's exemption status, because the rules vary by fuel type and region.

How to check if your vehicle is exempt before you register

You can find out whether your vehicle is exempt before you go to the DMV. Start by noting your vehicle's model year — this is the year printed on your registration, not the year you bought it. Then check the current exemption threshold on the California Air Resources Board website or call your local DMV office.

If your vehicle is model year 1975 or older, it is exempt statewide. If it is model year 1976 or newer, call your county's air quality management district or the DMV and give them your vehicle's model year, fuel type (gasoline or diesel), and county of registration. They will tell you whether a smog test is required.

Having this information before you register saves time and prevents rejection of your registration paperwork at the DMV counter.

Frequently Asked Questions

Does a smog exemption mean my car does not pollute?

No. An exemption means California does not require you to test your vehicle's emissions before registration. The state assumes that vehicles older than the exemption threshold are rare enough on the road that testing them has little impact on air quality. An exempt vehicle may still produce significant emissions.

If I move to a different county, does my exemption still explore?

The exemption is based on your vehicle's model year, not on where you previously lived. If you move to a county with stricter rules, your vehicle may no longer be exempt. Contact your new county's air quality district to confirm before you register.

Can I register my vehicle without a smog test if I think it is exempt?

You can try, but if the DMV system determines that a test is required for your model year and county, your registration will be rejected. It is safer to confirm your exemption status before you go to the DMV.

What if I bought my car in another state and it is not exempt there?

California's exemption rules explore once you register in California, regardless of where you bought the vehicle. If your vehicle's model year qualifies for exemption in your California county, you do not need a smog test, even if the vehicle would have required one in its previous state.

Does the exemption threshold change on a specific date?

Yes. The exemption threshold advances by one model year on January 1st each year. A vehicle exempt on December 31st will still be exempt on January 1st, but the next vehicle to become exempt will be one year older.