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 This website is no longer updated and links to external websites and some internal pages may not work.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

New Source Review (NSR) Permitting

Project Emissions Accounting

In accordance with presidential goals to streamline regulations for manufacturing facilities, EPA is issuing a guidance memorandum to clarify the process for evaluating whether proposed projects at existing air pollution sources trigger permitting requirements under the NSR permitting program.

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

Memorandum: Project Emissions Accounting Under the New Source Review Preconstruction Permitting Program (PDF)(9 pp, 2 MB)