An official website of the United States government.

We've made some changes to If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Fate, Exposure and Risk Models Download

The latest versions of the FERA models, documentation and input files are available to download from the tables below.   For air quality models, go to the EPA Support Center for Regulatory Atmospheric Modeling (SCRAM). Information on new files, models, and data, can be found at FERA Recent Additions.

Components Software Installation Files Documentation Input Files
TRIM.Fate TRIM Installation TRIM.FaTE Download TRIM.FaTE Documents TRIM.FaTE Public Reference Library
TRIM.ExpoInhalation/ APEX TRIM.ExpoInhalation/ APEX Download TRIM.ExpoInhalation/ APEX User's Guide APEX Input Files
TRIM.Risk TRIM.Risk Download TRIM.Risk User's Guide TRIM.Risk Input Files
HAPEM   HAPEM HAPEM User's Guide HAPEM Input File
HEM   HEM HEM User's Guide HEM-3 Input Files