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 This website is no longer updated and links to external websites and some internal pages may not work.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

Reviewing National Ambient Air Quality Standards (NAAQS)

Particulate Matter (PM) Standards - Planning Documents from Current Review

Planning documents in NAAQS reviews generally include the Integrated Review Plan and Risk and Exposure Assessment planning documents.

You may also be interested in the Integrated Review Plan for the Secondary NAAQS for Ecological Effects of Oxides of Nitrogen, Oxides of Sulfur and Particulate Matter or in other documents from the current particulate matter NAAQS review.