The HAPEM model has been designed to estimate inhalation exposure for selected population groups to various air toxics. Through a series of calculation routines, the model makes use of ambient air concentration data, indoor/outdoor microenvironment concentration relationship data, population data, and human activity pattern data to estimate an expected range of inhalation exposure concentrations for groups of individuals.

Two versions of this model are currently available; HAPEM5 and HAPEM6. For further background information, including the history of development for HAPEM, go to the archive page, Further Technical Details about HAPEM4.

• Download Model

• User's Guides for HAPEM5, HAPEM6, and HAPEM7.

• Peer Review and Publications. For information about the peer review of HAPEM4, go to Appendix-K, HAPEM4 Results, on the archived page for the National-Scale Air Toxics Assessment for 1996.

• Other Supporting Documents