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 This website is no longer updated and links to external websites and some internal pages may not work.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

Fact Sheet - Exceptional Events Interim Guidance

On May 10, 2013, the U.S. Environmental Protection Agency (EPA) issued interim guidance to help air agencies manage air quality data recorded during “exceptional events.” This fact sheet summarizes that action.

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

Fact Sheet - Exceptional Events Interim Guidance (PDF)(3 pp, 98 K)