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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 | Metadata Last Checked: January 27, 2026 | Last Modified: 2014-01-01T00:00:00.000+00:00
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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