![[logo] US EPA](../gif/logo_epaseal.gif){kind=logo}
1999 Modeled Human Exposure
Note: EPA no longer updates this information, but it may be useful as a reference or resource.|
•
Exposure Concentrations Data Tables |
| • About the Exposure Model (HAPEM) |
|
•
Health Effects Criteria |
|
Exposure Concentrations Data Tables This link provides all the data tables associated with the 1999 national-scale assessment and includes not only exposure concentration information but also emissions, ambient concentration and risk estimates. Tables are organized so you can see data specific to an individual pollutant or data specific to a State. Most of these tables are available as a downloadable file in Microsoft Access format. A few are Adobe Acrobat pdf files. Both pollutant-specific and State-specific tables contain exposure concentration distributions (i.e., as percentiles) as well as a breakdown of exposure concentrations into major, area, onroad mobile and nonroad mobile and background contributions. The county information includes a designation as urban or rural. About the Exposure Model (HAPEM) The HAPEM model has been designed to predict the "apparent" inhalation exposure for specified population groups and air toxics. Through a series of calculation routines, the model makes use of census data, human activity patterns, ambient air quality levels, climate data, and indoor/outdoor concentration relationships to estimate an expected range of "apparent" inhalation exposure concentrations for groups of individuals. Further technical details about the HAPEM model including new features of the latest version (HAPEM5) are available. Other exposure and risk models can be found at the FERA (Fate, Exposure, and Risk Analysis) Web site. Health Effects Criteria This link provides cancer and noncancer information which is associated with each toxic air pollutant as well as a reference to the source of that information. |