USA: 2025 Updates to Oregons Clean Truck Rules
Updated on : 23-07-2025
| On 10 July 2025, the Environmental Quality Commission (EQC), the policy and rulemaking board for the Oregon Department of Environmental Quality (DEQ), adopted permanent rules for new medium- and heavy-duty vehicles across the state. This action replaces and ensures Oregon is aligned with recent changes to California Air Resources Board (CARB) regulations. Oregon has chosen to follow California's medium- and heavy-duty vehicle emission standards. The permanent rules take effect immediately.The Clean Truck Rules were originally adopted in 2021. They are composed of two separate regulations:Oregon’s Advanced Clean Trucks Rule: Also known as the “ACT Rule,” it requires manufacturers to gradually sell a greater percentage of medium- and heavy-duty zero-emission vehicles in the state each year, starting with 2025 model year vehicles. Additional updates include the following: Increased Deficit Makeup Period – Manufacturers now have three years instead of one year to balance their zero-emission vehicle (ZEV) deficits (deficits accrued due to insufficient sales of ZEVs under the rules).New definition for how credits are generated – Manufacturers can now generate a credit based on a vehicle delivered for sale rather than to the ultimate purchaser in Oregon.Additional flexibility in 2026 for the cleanest Heavy Heavy-Duty (HHD) Engines - Specific HD Omnibus certified engines would not generate deficits in 2026 under the ACT Rule, easing compliance for manufacturers of the subject heavy heavy-duty internal combustion engine (ICE) trucksOregon's Heavy-Duty Engine and Vehicle Omnibus Rule: Frequently referred to as the “Heavy-Duty Low NOx Omnibus Rule,” it lowers emission standards for on-road, conventionally fueled, new heavy-duty vehicles and engines, specifically for oxides of nitrogen and fine particulate matter. It will now begin with engine model year 2027. At that time, DEQ will require engines in these vehicles to emit 90% fewer NOx emissions and 50% fewer PM5 emissions compared with 2023 engines.The permanent rules do not ban the sale of new conventional diesel trucks, nor do they require dealers or businesses to purchase ZEV trucks.In May of this year, DEQ announced it will use its enforcement discretion for the ACT Rule. The directive’s goal is to provide temporary relief to manufacturers facing challenges in meeting zero-emission vehicle sales targets, and to businesses and fleet owners across the state in need of new conventional and ZEV trucks. It ensures continued availability of internal combustion engine trucks to meet market demands, while maintaining progress toward Oregon's environmental goals. The enforcement discretion does not affect the Heavy-Duty Low NOx Omnibus Rule.Sign up through DEQ’s GovDelivery system to receive the latest information on the Clean Truck Rules by email. |
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