Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Contact Us about Particulate Matter (PM) Pollution

Information is also available for the following topics:

or other indoor locations

For comments or questions on the national ambient air quality standards for PM more generally, please use the form below to send us comments or questions. Be sure to include your e-mail address if you’d like a response.

Mailing Address:

Environmental Protection Agency
Office of Air and Radiation (OAR) 6101A
1200 Pennsylvania Avenue, N.W.
Washington, DC 20460