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 This website is no longer updated and links to external websites and some internal pages may not work.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

Search Air Permit Policy & Guidance Databases

Since 1978, EPA has provided guidance to Regions, States and Permittees to assist in the implementation of its Clean Air Act permitting programs. This page provides the ability to search almost 1,500 documents by keyword or phrase. You can select one or more individual compilations or search all. See "Search Tips" below for suggestions on how to build your query.

Many documents in the database are a scanned or retyped version of a paper photocopy of the original. We have taken considerable effort to quality assure the documents, but some may contain typographical errors. You will need Adobe Reader to view the files on this page. See EPA’s About PDF page to learn more.

Search areas:

You can also view each of the document compilations above in sortable, filterable tables.

Search Tips

By default, a search locates documents containing the search terms specified with the terms that are entered first given more weight than the terms that come after. When you want documents containing any of several words, use commas to separate them.

For example, searching for:

1) "operating permit"

will find documents that contain the phrase operating permit.

2) operating OR permit

will find documents that contain either operating or permit. Note that the OR must be capitalized.

3) operating -permit

will find documents that contains operating and exclude documents that contain permit. Therefore, it will exclude documents that has the phrase "operating permit" in them.