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In page Clean Air Act (United States):

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Pursuant to one of the most public aspects of the Clean Air Act, EPA is empowered to monitor compliance with the law's many requirements, seek penalties for violations, and compel regulated entities to come into compliance.[1] Enforcement cases are usually settled, with penalties assessed well below maximum statutory limits.[citation needed] Many of the largest Clean Air Act settlements have been reached with automakers accused of circumventing the Act's vehicle and fuel standards (e.g., the 2015 "Dieselgate" scandal).[2]