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 This website is no longer updated and links to external websites and some internal pages may not work.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

General Conformity

Final revisions to the General Conformity Regulations

On March 24, 2010, EPA revised the General Conformity regulations. The revised rule improves the process federal entities use to demonstrate that their actions will not contribute to a violation of a national air quality standard.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.