Risk Assessment Perspectives on Air Dispersion Modeling (original) (raw)

Abstract

Risk assessors frequently use air dispersion models to estimate exposure point concentrations in assessing potential risks to human health and the environment. Most typically, models are used to predict ambient concentrations of contaminants emitted from a variety of different sources of concern, and the assessments overlap with air quality assessments required for Clean Air Act (CAA) permitting. For reasons of consistency and facilitating acceptance (both by the public and the regulatory community), risk assessments are often based on the same models used to demonstrate CAA compliance (i.e., the Appendix W models supported by the Office of Air Quality Planning and Standards). The needs of risk assessors, however, sometimes extend beyond CAA compliance requirements for Title V permitting. As examples, risk assessments of combustion source emissions frequently require multi-pathway models to assess contaminant deposition from the atmosphere and subsequent incorporation into terrestri...

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