Instructions for using the Human Exposure Model (AERMOD version). Guides are available for HEM4 and for HEM-3 (for Single Facility Modeling as well as for Multiple Facility Modeling with Risk and Technology Review Summary Programs).You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.
- HEM4 User's Guide (PDF)(156 pp, 7 MB, October 2020)
- Single-facility HEM-3 User's Guide (PDF)(104 pp, 2 MB, January 2019)
- Multi-facility HEM-3 and RTR Summary Programs User's Guide (PDF)(67 pp, 3 MB, April 2019)