LATEST U.S. EPA UPDATES
The United States Environmental Protection Agency (U.S. EPA) is constantly updating the AERMOD Modeling System and its associated components: AERMAP, AERMET, AERSCREEN, and AERSURFACE. AERMOD, AERMAP, and AERMET make up the preferred/recommended models to be used for near-field air dispersion modeling analyses as promulgated in Appendix W of the United States Code of Federal Regulations (40 CFR Part 51).
Whenever changes are made to these models, we will update this page with the latest information regarding each of these programs. Bookmark this page and check it often for updates!
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AERMOD - NEW VERSION 09292
A new version of AERMOD was released on October 23, 2009. This version represents a major change from previous versions with many bug fixes, enhancements, and miscellaneous changes. Details on the changes can be found in the Model Change Bulletin.
Updated EPA AERMOD User's Guide (version 09292)
Previous EPA AERMOD User's Guide
Model Change Bulletin #1 (Release of AERMOD 06341)
Model Change Bulletin #2 (Release of AERMOD 07026)
Model Change Bulletin #3 (Release of AERMOD 09292)
AERMOD Implementation Guide (Released on March 19, 2009)
AERMAP
On March 19, 2009, a new AERMOD Implementation Guide was released by the U.S. EPA providing information on the new AERMAP executable dated 09040. Click here to read the full document.
A new version of AERMAP was released on February 9, 2009. This version represents a major change from previous versions. Some of the changes and enhancements include:
- Dynamic allocation to allow for unlimited sources, receptors, buildings, and DEM files
- Allows the use of National Elevation Dataset (NED) GeoTIFF files
- Added functionality to use mixed Digital Elevation Model (DEM) files of varying sizes (7.5-minute & 1-degree files can be used in the same AERMAP run)
- Automatic selection of the hill height domain as the extent of all terrain files
- Support for DEMs in the Southern & Eastern hemispheres
BREEZE AERMOD version 7 has the latest version of AERMAP included.
EPA AERMAP User's Guide (includes Addendums from 06341 & 09040)
Model Change Bulletin #2 (Release of AERMAP 09040)
AERMET
The current version of AERMET is 06341.
EPA AERMET User's Guide (includes Addendum from 06341)
AERSCREEN
AERSCREEN is the screening model for the AERMOD modeling system. The EPA is currently working on a beta version of the code which will be released as soon as possible. Check back for updates on the release of AERSCREEN.
AERSURFACE
AERSURFACE is a tool that processes land cover data to determine surface characteristics necessary to run AERMET. While the program is not an Appendix W model, the methodology used in AERSURFACE is required to be used in AERMOD modeling analyses.
AERMOD Implementation Guide - January 9, 2008 (Release of AERSURFACE 08009)