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 This website is no longer updated and links to external websites and some internal pages may not work.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

Indoor Air Quality (IAQ)

Pollutant Pathway Form for Investigations

This form about pollutant pathways, which is from the Building Air Quality: A Guide for Building Owners and Facility Managers, should be used in combination with a floor plan such as a fire evacuation plan.

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