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 This website is no longer updated and links to external websites and some internal pages may not work.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

Particulate Matter (PM) Pollution

2012 Particulate Matter National Ambient Air Quality Standards (NAAQS) Nonattainment Actions

These actions deal with the finding of failure to submit various portions of the State Implementation Plans (SIPs) for the 2012 National Ambient Air Quaity Standards (NAAQS) Particulate Matter standards.

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