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 This website is no longer updated and links to external websites and some internal pages may not work.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 »

National Environmental Policy Act Policies and Guidance

EPA has prepared policies and guidance for carrying out its responsibilities under the National Environmental Policy Act (NEPA) and reviews under Section 309 of the Clean Air Act. These documents discuss the specific technical issues EPA looks for in NEPA documents. To learn more, select the topic from the list below.