Arizona Emissions Testing Overview

Arizona requires emissions testing for certain vehicles to help improve air quality and meet federal environmental standards. Managed by the Arizona Department of Environmental Quality (ADEQ), the emissions program applies primarily to drivers in the Phoenix and Tucson metropolitan areas.

Understanding whether your vehicle needs testing, how to prepare, and where to go are crucial to staying compliant and avoiding penalties.

Who Needs an Emissions Test in Arizona?

Emissions testing is generally required for vehicles registered in the following counties:

• Maricopa County (including Phoenix)
• Pima County (including Tucson)

Testing requirements apply based on the vehicle's age, type, and fuel used:

• Gasoline-powered vehicles 1981 and newer must be tested biennially.
• Older vehicles (1980 and earlier) may require annual testing.
• Diesel vehicles weighing under 8,500 lbs are subject to testing if registered in the applicable areas.
• Alternative fuel vehicles such as flex-fuel or hybrids may still need testing depending on model year and location.

New vehicles are typically exempt for their first five years, but be sure to confirm the exemption based on your registration notice.

Exemptions from Emissions Testing

You may be exempt from testing if:

• Your vehicle is registered outside of the emissions control areas.
• Your vehicle is less than five years old.
• It is a motorcycle, electric vehicle, trailer, or a golf cart.
• You are a member of the military stationed outside Arizona with your vehicle.

Always check your renewal notice or the Arizona Emissions Testing Exemptions page for the latest criteria.

Where to Get Your Vehicle Tested

Arizona operates several emissions testing stations, especially in Maricopa and Pima counties. You can find an up-to-date list and hours of operation on the official ADEQ testing locations page.

Be sure to bring:

• Your vehicle
• Vehicle registration or renewal notice
• Payment (cash, credit, or debit cards are usually accepted)

No appointment is necessary for most testing stations, but it's best to go during off-peak hours to avoid long wait times.

Cost of Emissions Testing

The cost of testing varies based on vehicle type and model year:

• Most passenger vehicles: $12–$20
• Heavy-duty vehicles: Up to $25

Exact fees are listed on your registration renewal notice or can be confirmed at the testing station.

Failing an Emissions Test

If your vehicle fails the emissions test:

1. You must have the necessary repairs made.
2. Retest the vehicle at an emissions testing station.
3. Submit any required documentation for a waiver if repairs exceed a certain cost threshold and the vehicle still fails.

ADEQ offers a Voluntary Vehicle Repair Program that may help eligible vehicle owners cover repair costs. Details are available on the ADEQ Repair Program page.

Preparing for Your Emissions Test

To improve your chances of passing:

• Make sure your vehicle is properly maintained.
• Drive your vehicle for 15–20 minutes before the test to ensure it’s fully warmed up.
• Avoid getting tested right after resetting your vehicle’s onboard diagnostics system.

Proper preparation can prevent failed tests and unnecessary retesting.