An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Regulations for Emissions from Vehicles and Engines

Final Rule on Ozone Transport Commission; Low Emission Vehicle Program for the Northeast Ozone Transport Region

On this page:

Rule Summary

Final determination that reduction of new motor vehicle emissions throughout the Northeast Ozone Transport Region (OTR) is necessary to mitigate the effects of air pollution transport and to bring nonattainment areas in the OTR into attainment (including maintenance) of the national ambient air quality standard for tropospheric ozone (smog). This action approved the recommendation of the Ozone Transport Commission (OTC) and promulgated a rule under sections 184 and 110 of the Clean Air Act that required emission reductions from new motor vehicles in the OTR equivalent to the reductions that would be achieved by the OTC Low Emission Vehicle (OTC LEV) program.

Regulations for Emissions from Vehicles and Engines Home