An official website of the United States government.

We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Air Quality Guidance for National Environmental Policy Act Reviews

Using MOVES and EMFAC Emissions Models in NEPA Evaluations provides information for assessing criteria air pollutant impacts.

Reflecting the Revised PM 2.5 National Ambient Air Quality Standard in NEPA Evaluation provides information on how to reflect the revised PM 2.5 National Ambient Air Quality Standard in NEPA evaluations.

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