EPA Checks California's Big Truck Tune-Ups to Fight Smog
Published Date: 8/26/2025
Proposed Rule
Summary
The EPA is reviewing California’s plan to check and reduce pollution from big trucks and buses over 14,000 pounds. They’re okay with some parts but not with rules for vehicles registered outside California. This means some new rules might start soon, but others need more work, and the EPA wants your thoughts before deciding.
Analyzed Economic Effects
2 provisions identified: 0 benefits, 0 costs, 2 mixed.
Out‑of‑state heavy trucks excluded
EPA is proposing to disapprove California’s Heavy‑Duty Inspection and Maintenance Regulation only to the extent it applies to vehicles registered out‑of‑state or out‑of‑country. The rule being reviewed covers non‑gasoline combustion vehicles over 14,000 pounds.
Partial or full approval will change rule status
EPA proposes either a partial approval/partial disapproval or full approval of California’s submission. If finalized as partial approval/partial disapproval, certain aspects of the covered State regulations would go into effect and the action would not trigger Clean Air Act (CAA) section 179 sanctions because the submittal is not a required submission under CAA section 110(a)(2); if finalized as an approval, all covered State regulations would go into effect.
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Key Dates
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