CMAQ: The Community Multiscale Air Quality Modeling System

Latest Release: CMAQv5.3.3
- Learn about new features in our latest release
- CMAQ source code and User's Guide available on GitHub
- Watch the CMAQv5.3 webinar on Enhanced Capabilities to Analyze Emissions Scenarios
Evaluation of 15 years of modeled NOX across the US
- Learn more about a new study in Elementa and other research highlights related to the CMAQ system
Modeling Per- and Polyfluoroalkyl Substances (PFAS) with CMAQ
- Learn more about a new study in Environmental Science & Technology
Using CMAQ to Understand Emissions from Volatile Chemical Products (VCPs)
- Learn more about a new study in Nature Sustainability

CMAQ (see-mak): an active open-source development project of the U.S. EPA that consists of a suite of programs for conducting air quality model simulations. CMAQ combines current knowledge in atmospheric science and air quality modeling, multi-processor computing techniques, and an open-source framework to deliver fast, technically sound estimates of ozone, particulates, toxics and acid deposition.

Learn about CMAQ

CMAQ Applications

Download CMAQ

CMAQ Research

CMAQ Community

CMAQ Output

CMAQ: The Community Multiscale Air Quality Modeling System

Latest Release: CMAQv5.3.3

Evaluation of 15 years of modeled NOX across the US

Modeling Per- and Polyfluoroalkyl Substances (PFAS) with CMAQ

Using CMAQ to Understand Emissions from Volatile Chemical Products (VCPs)

Frequent Questions about CMAQ