The evolution of US NOx standards for cars
Environment, Law, and History
AUGUST 27, 2023
Dan Farber at Legal Planet recently posted on "Cars, Smog, and EPA" An excerpt: For the first 20 years of federal regulation, Congress set the NOx [nitrogen oxides] standards for new cars itself. The initial standard, set in the 1970 Clean Air Act, was 3.1 EPA, 1973). grams per mile (gpm) for NOx.
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