Cars, Smog, and EPA
Legal Planet
AUGUST 24, 2023
The reason may have been the high political stakes in the car industry or the relatively easier task of setting standards for new products in a single industry using a single energy process. The initial standard, set in the 1970 Clean Air Act, was 3.1 grams per mile (gpm) for NOx. These are called Tier 1 standards.
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