![[logo] US EPA](http://www.epa.gov/epafiles/images/logo_epaseal.gif){kind=logo}
NHEXAS
National Human Exposure Assessment Survey
Sponsored by
National Exposure Research Laboratory
National Center for Environmental Assessment
Office of Research and Development
U.S. Environmental Protection Agency
The National Human Exposure Assessment Survey (NHEXAS) was developed by the Office of Research and Development (ORD) of the U.S. Environmental Protection Agency (EPA) early in the 1990s to provide critical information about multipathway, multimedia population exposure distribution to chemical classes. The first phase consisted of three pilot studies with the objectives of:
- Evaluating the feasibility of NHEXAS concepts, methods, and approaches for the conduct of future population-based exposure studies;
- Evaluating the utility of NHEXAS data for improved risk assessment and management decisions;
- Testing the hypothesis that the distributions of exposure given by modeling and extant data do not differ from the measurement-based distributions of exposure;
- Defining the distribution of multipathway human exposures for a relatively large geographic area; and
- Stimulating exposure research and forging strong working relationships between government and nongovernment scientists.
- NHEXAS began before the enactment of the Government Performance and Results Act (GPRA), which was written to ensure accountability in the use of resources. Thus, we add a "new" objective in the form of a hypothesis: NHEXAS approaches can be used to develop a "GPRA Report Card" on the efficiency of EPA’s regulations to reduce exposure.
Results: