The Air Pollutants Exposure model (APEX) is part of EPA’s overall Total Risk Integrated Methodology (TRIM) model framework. The documents below are for APEX 5.2. The User Guides and Technical Documentation support the TRIM.Expo Inhalation / APEX model.
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.- An Introduction to APEX (2017) (PDF)(109 pp, 4 MB)
- Air Pollutants Exposure Model Documentation (APEX, Version 5.2) Volume I: User's Guide (PDF)(147 pp, 1 MB, November 2019, EPA-452/R-19-005a)
- Air Pollutants Exposure Model Documentation (APEX, Version 5.2) Volume II: User's Guide (PDF)(145 pp, 2 MB, November 2019, EPA-452/R-19-005b)