Arizona’s smog laws require an emissions test for most vehicles registered in the Phoenix and Tucson metropolitan areas once the vehicle is more than five model years old. Testing does not apply statewide. If your vehicle is registered inside the designated zones, or you commute into one for work, you need a passing test before the Motor Vehicle Division will renew your registration.
Who Has to Get Tested
The program covers two zones. Area A takes in parts of Maricopa and Pinal counties around greater Phoenix. Area B covers a section of Pima County around Tucson.1Arizona Department of Environmental Quality. Vehicle Emission A and B Area Explained If the address on your registration sits inside either zone, and your vehicle is model year 1967 or newer and more than five model years old, you need to test.2AZdot.Gov. Emissions Overview
Living outside the zones does not automatically get you off the hook. Arizona law also requires testing for drivers who commute to a principal place of employment inside Area A or Area B, even if the vehicle is registered elsewhere. Affected commuters pass the test, submit a compliance form to ADOT, and pay a $0.25 air quality compliance fee, after which ADOT issues an air quality compliance sticker.3Arizona Legislature. Arizona Revised Statutes Title 49 – 49-542 Emissions Inspection Program Vehicles leased from a company inside the zones to a driver who lives outside them are not subject to the commuter rule.
Boundaries can shift. ADEQ reviews air quality monitoring data and can expand or contract the testing areas, and moving into Area A or Area B from elsewhere in the state makes your vehicle subject to testing regardless of its previous registration.
Vehicles That Are Exempt
Several categories of vehicles skip testing entirely:
- New vehicles, until their sixth registration year after purchase or lease (roughly the first five years on the road).
- Model year 1966 and older vehicles. The statute allows this cutoff to extend to 1974 if the EPA grants a federal exemption for those years.
- Fully electric vehicles.
- Vehicles registered as collectible with ADOT.
- All motorcycles.
- Golf carts and vehicles with engine displacement under 90 cubic centimeters.
Hybrids are not on the list. Once a hybrid ages past the new-vehicle window, it tests like any other gasoline car.
How Often You Test and What Kind of Test
Frequency and test type depend on where the vehicle is registered, its model year, and its fuel.
Phoenix Area (Area A)
Gasoline vehicles with a gross vehicle weight rating of 8,500 pounds or less follow this pattern:
- 1996 and newer: every two years, using an onboard diagnostics (OBD) check that plugs into the vehicle’s computer.
- 1981 through 1995: every two years, using a transient loaded test on a dynamometer that simulates driving conditions.
- 1975 through 1980: annually, using a steady-state loaded test.
- 1967 through 1974: annually, using the same loaded test.
Diesel vehicles in Area A are tested annually regardless of model year, using a snap idle test that measures exhaust opacity.
Tucson Area (Area B)
Area B currently requires annual testing for all non-diesel vehicles, regardless of model year, until a state implementation plan revision is approved by the EPA. Once that revision takes effect, OBD-certified vehicles will move to a two-year schedule while older non-OBD vehicles will keep testing annually.4Cornell Law Institute. Arizona Admin Code R18-2-1006 – Emissions Test Procedures Diesel vehicles in Area B test annually using a loaded opacity test.
The practical result: a 1996-or-newer gasoline car in Phoenix tests every other year, but the same car in Tucson currently tests every year.
Fees and Timing
Get your test done no more than 90 days before your registration expires.3Arizona Legislature. Arizona Revised Statutes Title 49 – 49-542 Emissions Inspection Program Results transmit electronically to the Motor Vehicle Division, so you do not need to carry paperwork to renew, though keeping the compliance certificate as a backup is wise.
Test fees are paid at the station:
- Phoenix OBD test (1996 and newer): $16.15
- Phoenix steady-state loaded and idle tests: $15.20
- Phoenix snap opacity test for diesels: $23.75
- Tucson OBD test: $16.15
- Tucson loaded tests: $12.25
ADOT directs drivers to myAZcar.com to find station locations.5Department of Transportation. Emissions Testing
If Your Vehicle Fails
A failed test blocks registration until the problem is fixed. The station gives you a Vehicle Inspection Report listing the specific failures. Take that report to a mechanic, get the repairs done, and come back for a retest.
Retest within 60 days of the initial failure and the retest is typically submitted at no additional charge. If your repairs came through the Voluntary Vehicle Repair Program, you have seven days to retest.6Arizona Department of Environmental Quality. Voluntary Vehicle Repair Program Frequently Asked Questions If a VVRP-repaired vehicle still fails, the repair facility has to keep working on it at no extra cost until it passes.
Help Paying for Repairs
Emissions repairs get expensive fast. Arizona has two programs that can help.
Voluntary Vehicle Repair Program
ADEQ’s Voluntary Vehicle Repair Program pays part of the cost of emissions-related repairs after a failed test. For gasoline vehicles and light-duty diesels, the program covers up to $900. You pay a $100 copayment up front and the approved shop bills ADEQ for the rest.6Arizona Department of Environmental Quality. Voluntary Vehicle Repair Program Frequently Asked Questions For diesel vehicles with a GVWR over 8,500 pounds, the program covers up to $1,000, with the owner paying half the total repair cost.7Arizona Legislature. Arizona Revised Statutes Title 49 – 49-558.02 Voluntary Vehicle Repair Program
If your vehicle’s emissions control equipment has been altered or tampered with, you are disqualified.8Arizona Department of Environmental Quality. Voluntary Vehicle Repair Program Overview Removing a catalytic converter or disabling an oxygen sensor puts the vehicle outside the program. The help is meant for cars that have aged out of compliance, not ones modified to defeat their emissions systems.
Repair Waivers
If a vehicle still cannot pass after a set amount of documented repair spending, Arizona may issue a certificate of waiver allowing temporary registration. You have to show that the money went to a recognized repair facility for legitimate emissions work.9Legal Information Institute. Arizona Admin Code R18-2-1008 – Procedure for Issuing Certificates of Waiver The required spending threshold varies by vehicle age, location, and fuel type. A waiver buys time, not a permanent pass; the vehicle comes back into the system at the next cycle.
If You’re Out of State or Deployed
You do not have to drive back to Arizona just to test. Two exemptions cover vehicles that are away when registration comes due:
- Out-of-state exemption: the vehicle must have been outside Arizona for at least 90 days before registration expires. If it is in an area of another state that requires emissions testing, you pass that state’s test and send the passing report to ADEQ. If it is in an area with no testing, you apply for the out-of-state exemption directly.
- Military exemption: available to active-duty service members stationed outside Arizona if the vehicle is not being used. If someone else is driving it during a deployment, this exemption does not apply and the standard out-of-state exemption is the right route.
Both are handled through ADEQ’s online portal.10Arizona Department of Environmental Quality. Types of Emissions Inspection Exemptions
What Happens If You Skip It
The main consequence is a registration hold. Arizona will not issue or renew registration without a passing emissions test or a valid waiver. Driving an unregistered vehicle exposes you to traffic citations, fines, and potential impoundment, and the fine amounts vary by jurisdiction. The bigger problem is the hold itself, which makes the vehicle illegal to drive until the emissions issue is resolved.