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 This website is no longer updated and links to external websites and some internal pages may not work.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

Office of Inspector General

Report: Progress Made in Monitoring Ambient Air Toxics, But Further Improvements Can Increase Effectiveness

Report #2005-P-00008March 2, 2005

What Was Found

The CAA does not require a national air toxics monitoring network, but EPA and State and local agencies have recognized such a network is needed.

Report Materials

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