Photochemical Modeling Tools
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,
on the Use of Models and Other Analyses for Demonstrating Attainment of
the Air Quality Goals for Ozone, PM2.5, and Regional Haze."
- MATS version 2.5.1:
Version 2.5.1 includes an update to the 24-hour PM2.5 attainment test as outlined in the following guidance memo:
Update to the 24 Hour PM2.5 NAAQS Modeled Attainment Test
Additional changes are documented here: version 2.5.1 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 are not implemented in this version.
There are updates to the ambient datasets in this installer package (see
change log). Updates to ambient datasets will be included in future
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 2.5.1 installer package - The installer package is large (~200Mb) due to the inclusion of several large example model and ambient datasets.
- MATS 2.5.1 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 2.5.1 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.