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Photochemical Modeling Tools

MATS

The Air Quality Modeling Group has developed the Modeled Attainment Test Software (MATS). MATS is a PC-based software tool that can perform the modeled attainment tests for particulate matter (PM2.5) and ozone (O3), and calculate changes in visibility at Class I areas as part of the uniform rate of progress analysis for regional haze. Detailed information on the recommended attainment tests can be found in U.S. EPA's modeling guidance, Guidance on the Use of Models and Other Analyses for Demonstrating Attainment of the Air Quality Goals for Ozone, PM2.5, and Regional Haze."


Downloads
As MATS is being refined, there will likely be frequent updates. If you are interested in receiving an email notice when updated versions are available, please complete the fields below (optional). You may contact EPA regarding MATS at: mats@epa.gov



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  • MATS version 2.3.1: A major upgrade in Version 2.3.1 is the addition of the 24-hour PM2.5 attainment test. The changes are documented here: version 2.3.1 change log This version performs the ozone, annual average PM2.5, 24-hour PM2.5, and visibility tests outlined in the modeling guidance. Note that spatial fields for the 24-hr PM2.5 test is not yet implemented in this version.

    The new 24-hour PM2.5 test uses the same default PM2.5 ambient data sets as the annual PM2.5 test. There are limited updates to the ambient datasets in this installer package (see change log). Updated ambient datasets will be included in a future release.

    If a previous version of MATS is installed, please uninstall the old version (using Windows "add or remove programs") before installing the new version.

    • MATS 2.3.1 installer package - The installer package is large (~180Mb) due to the inclusion of several large example model and ambient datasets.

    • MATS 2.3.1 executable - The executable (~7Mb) will only work if the installer package is installed first. We are providing the executable as a separate download because there may be periodic updates to the executable that don't require downloading and installing the entire installer package.

    • MATS 2.3.1 User's Manual - A PDF version of the user's manual is also included in the MATS installer package. Additionally, the user's manual is built into the help section of the MATS graphical user interface.

 

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