Community Modeling and Analysis System


CMAQ is an active open-source development project of the U.S. EPA Atmospheric Science Modeling Division that consists of a suite of programs for conducting air quality model simulations. CMAQ is supported and distributed by the CMAS Center.

CMAQ combines current knowledge in atmospheric science and air quality modeling with multi-processor computing techniques in an open-source framework to deliver fast, technically sound estimates of ozone, particulates, toxics, and acid deposition.

What's New in Version 5.2

Check out the Release Notes

CMAQ Review Process

CMAS, in collaboration with EPA scientists, has organized periodic CMAQ review panel meetings, of 3-day duration each. The review process usually starts by inviting a number of key scientists to participate in the process. The scientists are selected based on their expertise in accordance with the focus of the review session. After reviewing numerous reports and articles and completing their meeting in Research Triangle Park, North Carolina, the review panel prepares a comprehensive report on their findings and recommendations. EPA then responds to the comments of the reviewers. Final review reports are posted below.

Fourth Review (September 2011)

  • Final Report: Fourth Peer Review of the CMAQ Model, September, 2011 [PDF]

Third Review (February 2007)

  • Final Report: Third Peer Review of the CMAQ Model, February, 2007 [PDF]
  • Response to the Third Peer Review of the CMAQ Model, April, 2007 [PDF]

Second Review (May 2005)

  • Final Report: Second Peer Review of the CMAQ Model, July, 2005 [PDF]
  • Response to the Second Peer Review of the CMAQ Model, August, 2005 [PDF]

First Review (December, 2003)

  • Presentations (in PDF format):
  • Final Report Summary: December 2003 Peer Review of the CMAQ Model [PDF]

Latest Version: CMAQ version 5.2


CMAQ Training


Online Resources

Previous Documentation

System Requirements

O/S Linux
Processor 64-bit x86
Memory >1 Gb RAM
Disk Space > 80 Gb
Software VERDI, I/O API, netCDF,MPI, IDV, Portland Group Fortran, Intel Fortran