Cars, Smog, and EPA
Legal Planet
AUGUST 24, 2023
NOx plays a role in forming ground level ozone and final particulates (PM2.5), both of which are human health hazards. For the first 20 years of federal regulation, Congress set the NOx standards for new cars itself. Tier 3 standards were phased in starting with 2017 cars. gpm NOx standard.
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