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Health and Environmental Research Online (HERO) database

Published by U.S. EPA Office of Research & Development (ORD) | U.S. Environmental Protection Agency | Catalog Last Checked: May 06, 2026 at 12:38 AM | Dataset Last Updated: January 01, 2014 at 12:00 AM
HERO contains the key studies EPA uses to develop environmental risk assessments for the public. EPA uses risk assessments to characterize the nature and magnitude of health risks to humans and the ecosystem from pollutants and chemicals in the environment.

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