title: Advances in EPA's indirect exposure modeling methodology.
abstract: The Environmental Protection Agency's National Center for Environmental Assessment is currently revising and updating its approach to modeling the health risks from indirect exposure to combustor emissions. The updated method is intended to provide the necessary tools for estimating these health risks and to provide the necessary algorithms for the calculation of contaminant concentrations in water bodies, soil, and the terrestrial and aquatic food chains resulting from the deposition and transfer of atmospheric pollutants. Significant additions to the approach include the expansion of the application of exposure methods at a site, the description of procedures for defining the study population at a site, and ways to develop distributions of individual risk for members of the study population. This paper focuses on the changes in the human exposure scenarios of the update method and presents an overview of the development of an exposure scenario.
authors.affiliation: U.S. Environmental Protection Agency, National Center for Environmental Assessment, Cincinnati, OH 45268, USA.
authors.forename: S C
authors.initials: SC
authors.lastname: Schock
authors.forename: E G
authors.initials: EG
authors.lastname: Brady-Roberts
authors.forename: M
authors.initials: M
authors.lastname: Odin
mesh_terms: D004781:Environmental Exposure; D006801:Humans; D008962:Models, Theoretical; D018570:Risk Assessment; D014481:United States; D014484:United States Environmental Protection Agency