An official website of the United States government.

We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Community Multiscale Air Quality Modeling System (CMAQ)

Contact Us about the Community Multiscale Air Quality Modeling System

Report an environmental violation

Report possible violations of environmental laws and regulations.

Please contact us using the form below. Your contact information will be kept confidential.

Technical support for CMAQ, including questions about model inputs, downloading, compiling, and running the model, and pre- and post-processing utilities, should be directed to the Help Desk at the CMAS Center. EXIT

Mailing Address:

U.S. Environmental Protection Agency
National Exposure Research Laboratory
Computational Exposure Division
Atmospheric Model Application & Analysis Branch
Mail Code: D305-01
Research Triangle Park, NC 27711