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Emissions Testing Schedule in AZ

Arizona requires emissions testing for many vehicles registered in certain parts of the state to help control air pollution. The program is overseen by the Arizona Department of Environmental Quality (ADEQ), and compliance is necessary for vehicle registration in designated areas.

Where Emissions Testing is Required

Emissions testing is primarily required in two major areas:

  • Maricopa County (including Phoenix and surrounding cities)
  • Pima County (including Tucson)

If your vehicle is registered in either of these counties, it may be subject to emissions testing depending on its age, type, and fuel.

Who Needs Emissions Testing

Whether or not you need an emissions test depends on several factors:

  • Vehicle Age: Typically, vehicles that are newer than five model years old are exempt.
  • Vehicle Type: Most gasoline-powered vehicles, light-duty trucks, and diesel vehicles under 8,500 pounds are subject to testing.
  • Fuel Type: Alternative fuel vehicles may be exempt, depending on the certification of emissions compliance.
  • Residential Area: Your zip code determines if you're in a mandatory emissions test area.

Emissions Testing Schedule

Here's how often you need to test, depending on your vehicle:

  • Gasoline vehicles (model year 1981 or newer): Every 2 years
  • Diesel vehicles under 8,500 lbs: Annually
  • Vehicles 1967–1980 model year: Annual testing is required
  • Heavy-duty diesel vehicles (over 8,500 lbs): Annually, unless exempt

If your vehicle fails the emissions test, you must repair it and pass a re-test before renewing your registration.

When to Get Tested

ADEQ recommends testing your vehicle at least 60 days before your registration expires. You can also test early if you expect potential repair issues. Your renewal notice will indicate whether an emissions test is required.

Where to Get Tested

Arizona provides multiple official testing centers:

Hours vary by location, and some centers offer extended or Saturday hours for convenience.

Exemptions from Testing

You may be exempt from emissions testing if:

  • Your vehicle is a pure electric vehicle
  • Your vehicle is registered outside the emissions test area
  • Your vehicle is five model years old or newer
  • You have a classic car with a special insurance policy that limits mileage

You can request exemption status through the ADEQ Vehicle Emissions Inspection Program.

Preparing for the Emissions Test

Before heading to a testing site:

  • Make sure your Check Engine light is off
  • Drive your vehicle at highway speeds before the test to ensure the engine is fully warmed up
  • Bring your vehicle registration and payment method
  • Expect to pay $12–$25, depending on your vehicle and location

Staying compliant with emissions testing not only keeps your registration valid but also contributes to cleaner air and a healthier environment.