International Transport of Air Pollution

EPA is no longer relying upon its December 2020 Guidance on the Preparation of Clean Air Act Section 179B Demonstrations for Nonattainment Areas Affected by International Transport of Emissions. To avoid confusion, we have removed it from our website. For historical purposes, however, the guidance document remains publicly available at regulations.gov in Docket No. EPA-HQ-OAR-2019-0668.

Air agencies responsible for a nonattainment area that would be able to attain and maintain, or would have attained, the relevant National Ambient Air Quality Standard but for emissions emanating from outside the United States should consult section 179B of the Clean Air Act for information on developing and submitting to EPA a request demonstrating the impact. 

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