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Vehicles Tested and Exempted

Oregon's State Implementation Plan considers emission reductions needed in specific geographic areas and includes the following testing requirements for the Portland and Medford metro-areas:

Vehicles required to test in Portland

  • All 1975 and newer cars, trucks, vans, motor homes and buses powered by gasoline, alternative fuels (such as propane) or hybrids registered within the Portland testing boundaries.
  • All 1975 and newer diesel powered vehicles with a manufacturer's gross weight rating of 8,500 pounds or less (This includes all passenger cars and most light-duty trucks) registered within the Portland testing boundaries. If your diesel vehicle qualifies for this exemption, but you receive a DMV registration renewal, please visit a Clean Air Station for assistance.

Vehicles required to test in Medford

  • All cars, trucks, vans, motor homes and buses powered by gasoline, alternative fuels (such as propane) or hybrids 20 years old or less and registered within the DEQ Medford area boundaries.
  • All diesel powered vehicles 20 years old or less with a manufacturer's gross weight rating of 8,500 pounds or less (This includes all passenger cars and most light-duty trucks) registered within the DEQ Medford area boundaries. This includes all passenger cars and most light-duty trucks.

Portland and Medford Testing Exemptions

Other Portland and Medford Testing Information

For information about DMV registration and DEQ testing requirements, see page for Vehicles New to Oregon and Vehicles Temporarily Located Outside of Oregon.


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For questions or feedback on the Vehicle Inspection Program, visit our Questions and Comments page, or call one of our area contact numbers below:

  • Portland Area: 503-229-5066
  • Medford Area: 541-776-6145
  • Toll-Free in Oregon: 877-476-0583
  • Hearing Impaired: 711​


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