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Required in some areasSources checked Oct 7, 2026

Oregon emissions testing rules

Oregon's DEQ tests vehicles registered inside the Portland and Medford metro-area boundaries. Portland covers 1975 and newer vehicles; Medford covers vehicles 20 years old or less. The fee is $25 in the Portland area and $20 in Medford, and you pay only when the vehicle passes.

Where testing is required

Testing requirements apply in the Portland and Medford metro areas; vehicles registered outside the testing boundaries are exempt.

“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 legally registered outside the VIP testing boundaries”

Which vehicles are tested

Portland: all 1975 and newer gasoline, alternative-fuel and hybrid cars, trucks, vans, motor homes and buses, plus diesels of 8,500 pounds or less. Medford: the same kinds of vehicles when 20 years old or less.

“All 1975 and newer cars, trucks, vans, motor homes and buses powered by”

  • “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”
  • “diesel powered vehicles with a manufacturer's gross weight rating of 8,500 pounds or less”

What it costs

The fee is $25 in the Portland area and $20 in the Medford area, due only after the vehicle passes and gets a Certificate of Compliance.

“$25 . This fee is due only after your vehicle receives a passing test result, and is issued a Certificate of Compliance.”

  • “$20 in the Medford area. This fee is due only after your vehicle receives a passing test result, and is issued a Certificate of Compliance.”

Exemptions

Exemptions include newer model-year vehicles, vehicles registered outside the testing boundaries, heavy-duty diesels, motorcycles, low-speed vehicles and fully electric vehicles.

“Portland and Medford testing exemptions”

  • “Newer Model Year Vehicles”
  • “Vehicles legally registered outside the VIP testing boundaries”
  • “Heavy-duty diesel”
  • “Motorcycles, low-speed vehicles (mopeds, golf carts, tractors, all-terrain vehicles, etc.) and fully electric vehicles”

Oregon emissions testing questions

Does Oregon require emissions testing?

Yes. Required in some areas. Testing requirements apply in the Portland and Medford metro areas; vehicles registered outside the testing boundaries are exempt.

Which vehicles need an emissions test in Oregon?

Portland: all 1975 and newer gasoline, alternative-fuel and hybrid cars, trucks, vans, motor homes and buses, plus diesels of 8,500 pounds or less. Medford: the same kinds of vehicles when 20 years old or less.

How much does an emissions test cost in Oregon?

The fee is $25 in the Portland area and $20 in the Medford area, due only after the vehicle passes and gets a Certificate of Compliance.

Which vehicles are exempt in Oregon?

Exemptions include newer model-year vehicles, vehicles registered outside the testing boundaries, heavy-duty diesels, motorcycles, low-speed vehicles and fully electric vehicles.

Sources

Every quotation above is checked word for word against our saved copy of the page, on the date shown. Rules change; if a page has moved or says something different, tell us at the corrections page.