Oregon Truck Emissions & Clean-Truck Rules
Oregon won't test your truck's emissions when you're passing through. DEQ's Clean Air Stations only check lighter vehicles registered in the Portland and Medford areas. Oregon adopted Advanced Clean Trucks (OAR 340), a sales rule on manufacturers, but DEQ paused enforcement for model years 2025 and 2026 after the new-truck market stalled out. No report, fee, or test for you. Run your DPF and DEF the way EPA built them.
A detail here is flagged medium confidence — confirm with the state environmental agency or EPA before you rely on it.
How Oregon handles truck emissions
Oregon won't test your truck's emissions when you're passing through. DEQ's Clean Air Stations only check lighter vehicles registered in the Portland and Medford areas. Oregon adopted Advanced Clean Trucks (OAR 340), a sales rule on manufacturers, but DEQ paused enforcement for model years 2025 and 2026 after the new-truck market stalled out. No report, fee, or test for you. Run your DPF and DEF the way EPA built them.
What applies to you
- Program: ACT adopter
- State rule: No periodic heavy-truck emissions inspection for interstate trucks. DEQ Clean Air Stations test lighter vehicles registered in the Portland metro and Medford (Rogue Valley) areas, not interstate diesels passing through. Oregon adopted Advanced Clean Trucks (OAR 340) but DEQ paused enforcement for model years 2025-2026. Federal EPA standards apply.
- Penalty: No state emissions fine for a truck passing through. Federal EPA anti-tampering penalties apply to an emissions delete: about $45,000 per engine and roughly $4,500 per defeat device.
- DPF / DEF: Federal EPA equipment nationwide, never delete or tamper with it
Oregon Emissions FAQ
Does Oregon have a truck emissions program?
What is the emissions rule for trucks in Oregon?
What is the penalty for an emissions violation in Oregon?
Reference information for planning, not legal advice. Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it. Last reviewed July 2026. Source: https://www.oregon.gov/deq/aq/programs/pages/mdhdzev.aspx. See our Terms & Disclaimer.
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