AERMOD is the preferred air quality dispersion model of US-EPA and it is used all over the world as reference model for regulatory purposes.

On May 11, 2021, the U.S. EPA announced revisions to the AERMOD air dispersion model and its component AERMET, the meteorological data preprocessor.

These revisions include the update of AERMOD from version 19191 to version 21112.

AERMOD 21112 includes various bug fixes and some enhacements. The modifications are listed here for AERMOD, and here for AERMET.

AERSCREEN, the recommended screening model for simple and complex terrain for single sources and options for multi-source screening based on AERMOD, has also been updated to version 21112.