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 4.3. 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.- 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)