CMAQ

The Community Multiscale Air Quality (CMAQ) model is 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. 

For further information please visit the EPA website for the CMAQ system: www.epa.gov/cmaq

New features in CMAQ version 5.4 include:

• Updated chemistry for ozone (O3) and particulate matter (PM) formation from global-to-local scales
• Introduction of the Community Regional Atmospheric Chemistry Multiphase Model (CRACMM)
• Biogenic emissions algorithm options have been expanded
• Revised algorithms for modeling the dry deposition of particles from the atmosphere (M3DRY and STAGE updates)
• Streamlined building of the coupled WRF-CMAQ system compatible with WRFv4.4+
• Improved efficiency, accuracy, and user experience for CMAQ instrumented model extensions CMAQ-DDM-3D and CMAQ-ISAM
• Expansion of emissions diagnostic output features
• Introduction of a domain-wide Budget Reporting tool
• Online integration of common pollutant post-processing tasks (i.e. output total PM2.5 mass and more directly!)
• Community Contribution: Incorporation of the Two-Dimensional Volatility Bases Set (2D-VBS) chemical mechanism
• See the full list of CMAQv5.4 updates on our new CMAQ Wiki page. CMAQv5.4 Updates