Health Risk Values
A Health Risk Value (HRV) is the concentration of a chemical (or a defined mixture of chemicals) that is likely to pose little or no risk to human health. Most HRVs are expressed as concentrations of micrograms of chemical per cubic meter of air (µg/m3). HRVs are developed to protect human health for a specified length of exposure (e.g., one hour, 13 weeks, a lifetime). An HRV also may be expressed as micrograms of chemical per kilogram body weight per day of exposure (µg/kg-day). These values, called multi-media HRVs, are developed for chemicals emitted to ambient air where multi-media exposures are important to public health. These values are based on oral exposures.
Health Risk Values have been promulgated using the public process described in the Administrative Procedures Act (Minnesota Statutes Chapter 14). HRVs are used by agencies in evaluating health risks to humans from exposure to a chemical.