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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Environmental Protection Agency. (August 28, 2023). Light duty vehicle emissions standards for oxides of nitrogen (NOx) in the United States from 1975 to 2025 (in grams per mile driven) [Graph]. In Statista. Retrieved November 18, 2024, from https://www.statista.com/statistics/1457053/nox-emission-standards-for-light-duty-vehicles-us/
Environmental Protection Agency. "Light duty vehicle emissions standards for oxides of nitrogen (NOx) in the United States from 1975 to 2025 (in grams per mile driven)." Chart. August 28, 2023. Statista. Accessed November 18, 2024. https://www.statista.com/statistics/1457053/nox-emission-standards-for-light-duty-vehicles-us/
Environmental Protection Agency. (2023). Light duty vehicle emissions standards for oxides of nitrogen (NOx) in the United States from 1975 to 2025 (in grams per mile driven). Statista. Statista Inc.. Accessed: November 18, 2024. https://www.statista.com/statistics/1457053/nox-emission-standards-for-light-duty-vehicles-us/
Environmental Protection Agency. "Light Duty Vehicle Emissions Standards For oxides of Nitrogen (Nox) in The United States from 1975 to 2025 (in Grams per Mile Driven)." Statista, Statista Inc., 28 Aug 2023, https://www.statista.com/statistics/1457053/nox-emission-standards-for-light-duty-vehicles-us/
Environmental Protection Agency, Light duty vehicle emissions standards for oxides of nitrogen (NOx) in the United States from 1975 to 2025 (in grams per mile driven) Statista, https://www.statista.com/statistics/1457053/nox-emission-standards-for-light-duty-vehicles-us/ (last visited November 18, 2024)
Light duty vehicle emissions standards for oxides of nitrogen (NOx) in the United States from 1975 to 2025 (in grams per mile driven) [Graph], Environmental Protection Agency, August 28, 2023. [Online]. Available: https://www.statista.com/statistics/1457053/nox-emission-standards-for-light-duty-vehicles-us/
