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Nitrogen oxide (NOx) emission standards for light duty vehicles in the U.S. 1975-2025

Published by Ian Tiseo, Mar 25, 2024

Emission standards for nitrogen oxides (NOx) from light duty vehicles in the United States have strengthened since emission standards took effect in 1975. That year, average emission standards were 3.1 grams of NOx per mile driven. Current emission standards under the Tier 3 program, which are phased in from model year (MY) 2017 to (MY) 2025, are set at 0.3 g/mi. This is an improvement of roughly 99 percent from 1975. Road vehicle NOx emissions in the U.S. have fallen significantly since emission standards were introduced. 

Light duty vehicle emissions standards for oxides of nitrogen (NOx) in the United States from 1975 to 2025 (in grams per mile driven)

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Release date

August 2023

Region

United States

Survey time period

1975 to 2025

Special properties

Standards shown are the mandated NOx fleet averages.

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