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 4.5 and 4.3 and 3.x. The User Guides and Technical Documentation support the TRIM.Expo Inhalation / APEX model.
You will need Adobe Reader to view some of the files on this page. See EPA’s About PDF page to learn more.- Total Risk Integrated Methodology (TRIM) Air Pollutants Exposure Model Documentation (TRIM.Expo / APEX, Version 4.5) Volume I: User's Guide - EPA-452/B-12-001a August 2012 (PDF)(127 pp, 980 K)
- Total Risk Integrated Methodology (TRIM) Air Pollutants Exposure Model Documentation (TRIM.Expo / APEX, Version 4.5) Volume II: Technical Support Document, EPA-452/B-12-001b, August 2012 (PDF)(143 pp, 2 MB)
- Total Risk Integrated Methodology (TRIM) Air Pollutants Exposure Model Documentation (TRIM.Expo / APEX, Version 4.3) Volume I: User's Guide - EPA-452/B-08-001a October 2008 (PDF)(119 pp, 1 MB)
- Total Risk Integrated Methodology (TRIM) Air Pollutants Exposure Model Documentation (TRIM.Expo / APEX, Version 4.3) Volume II: Technical Support Document, EPA-452/B-08-001b October 2008 (PDF)(138 pp, 2 MB)
- Total Risk Integrated Methodology (TRIM) Air Pollutants Exposure Model Documentation (TRIM.Expo / APEX, Version 3.x) Volume I: User's Guide - April 24, 2003 (PDF)(112 pp, 1 MB)
- APEX 3.3 Updates, Summary of model changes from version 3.22, January 2006 (PDF)(16 pp, 73 K)