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 reasonable progress
analysis for regional haze. Detailed information
on the recommended attainment tests can be found in U.S. EPA's Draft modeling guidance,
for Demonstrating Attainment of Air Quality Goals for Ozone, PM2.5, and Regional Haze."
- MATS version 2.6.1:
Version 2.6.1 includes an update to the 8-hour ozone attainment test as outlined in the revised guidance document referenced above.
Additional changes are documented here: version 2.6.1 change log
This version performs the ozone, annual average PM2.5, 24-hour PM2.5, and regional haze tests outlined in the
There are also updates to the ambient datasets in this installer package (see
change log). Additional updates to ambient datasets will be included in future
releases and/or posted separately on this page.
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 2.6.1 installer package - The installer package is large (~208Mb) due to the inclusion of several large example model and ambient datasets.
- MATS 2.6.1 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 2.6.1 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.