The evolution of US NOx standards for cars
Environment, Law, and History
AUGUST 27, 2023
The initial standard, set in the 1970 Clean Air Act, was 3.1 Apparently Congress did not relish the task of periodically resetting the standards itself The 1990 Amendments authorized EPA to set standards for 2004 and beyond. ** This has to be considered a successful regulatory program. EPA, 1973).
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