An official website of the United States government.

We've made some changes to 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)

Community Multiscale Air Quality (CMAQ) Model Impact Statement

EPA's Community Multiscale Air Quality (CMAQ) Model is a comprehensive computer software package that provides state-of-the-art representation of the processes that affect the fate of airborne pollutants.

As a reliable and cost-effective tool, CMAQ provides EPA, states and air quality managers with a vital understanding of atmospheric processes necessary for managing air quality and protecting public health.

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