US environment agency (EPA) - public database on risk assessments

Health and Environmental Research Online (HERO) database.

http://www.epa.gov/hero

Access to the scientific studies used in making key regulatory decisions, including EPA's periodic review of the National Ambient Air Quality Standards (NAAQS) for six major pollutants.

HERO includes peer-reviewed literature used by EPA to develop its Integrated Science Assessments (ISA) that feed into the NAAQS review. It also includes references and data from the Integrated Risk Information System (IRIS), a database that supports critical agency policymaking for chemical regulation.