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Apr. 4, 2023
EPA Grants Waivers for California's On-highway Heavy-duty Vehicle and Engine Emission Standards
EPA is issuing a decision that grants two requests for waivers of preemption regarding four California Air Resource Board (CARB) regulations related to California's heavy-duty vehicle and engine emission standards. Under the Clean Air Act, California is afforded broad discretion to adopt emissions requirements to meet their significant air quality challenges, but they must seek waivers from EPA for new motor vehicle emission standards. In this instance, CARB requested two waivers for regulations relating to heavy duty vehicles and engines. After reviewing the technical information provided by CARB, reviewing comments submitted by the public, and applying the limited authority for review under section 209 of the Clean Air Act, EPA determined it appropriate to grant the waiver and authorization requests.
 


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