Diesel Emissions of Passenger Cars
Hollenshades Auto Service
JULY 7, 2023
Presently, the main driving standard for emissions output by vehicle powertrains are the US EPA Tier 2 and California LEV-II ULEV regulations. In 1999, the US EPA announced new Tier 2 NOx limits of 0.07gm per mile to replace the existing Tier 1 limits of 1.0gm per mile that were phased in from 2004 to 2009.
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