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U.S. Environmental Protection Agency Intergrated Risk Assessment System

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IRIS is a database of human health effects that may result from exposure to various substances found in the environment. IRIS was initially developed for EPA staff in response to a growing demand for consistent information on chemical substances for use in risk assessments, decision-making and regulatory activities. The information in IRIS is intended for those without extensive training in toxicology, but with some knowledge of health sciences.

http://cfpub.epa.gov/ncea/iris/index.cfm