Cars, Smog, and EPA
Legal Planet
AUGUST 24, 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. grams per mile (gpm) for NOx. These are called Tier 1 standards.
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