Audit, Compliance and Risk Blog

EPA estimates that hundreds of thousands of diesel trucks have been modified to defeat Clean Air Act emission limits

Posted by Jon Elliott on Mon, Jan 25, 2021

The Clean Air Act (CAA) authorizes the Environmental Protection Agency (EPA) to set emission standards for motor vehicles and engines. Although the primary focus is on Corporate Average Fuel Economy (CAFÉ) standards for new vehicles, set jointly by EPA and the Department of Transportation’s (DOT’s) National Highway Traffic Safety Administration (NHTSA) (I’ve discussed ongoing disputes about the latest CAFÉ standards several times, including HERE), EPA and states also have authority over post-sale “aftermarket” equipment and modifications to vehicles.

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Tags: EPA, CAA, CAFÉ, NHTSA, COC, AECDs, DOT's