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 This website is no longer updated and links to external websites and some internal pages may not work.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

Frequently Asked Questions: Area Sources in the Chemical Manufacturing Industry

Frequently asked questions on the national air toxics standards issued October 16, 2009 by the Environmental Protection Agency (EPA) for smaller-emitting sources, known as area sources, in the chemical manufacturing industry. 

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