The Minnesota Department of Health (MDH) promulgated Health Risk Values (HRVs) for chemicals in ambient air in March 2002. These values were established through a scientific and stakeholder involvement process. For additional information, see the links below, Air Guidance Values or contact us at health.risk@state.mn.us.

The Statement of Need and Reasonableness (SONAR) (PDF) for the HRV Rules provides a thorough description of the scientific methods and principles used to develop HRVs.

Note: SONARs are written for a specific step in the rule development process. The HRV SONAR does not reflect all information that was included in the HRV Rules. See the Responses to Comments on the Proposed Permanent Rule (PDF) for additional considerations and information incorporated into the HRV Rules.

Administrative Rules

4717.8000	Purpose and Scope.
4717.8050	Definitions.
4717.8100	Table of Chronic HRVs.
4717.8150	Table of Subchronic HRVs.
4717.8200	Table of Acute HRVs.
4717.8250	Table of mHRVs for Multimedia Exposure to Air Toxics.
4717.8300	Equations for Calculation of HRVs for Noncarcinogenic Effects of Toxicants.
4717.8350	Equation for Calculation of mHRVs for Noncarcinogenic Effects of Toxicants.
4717.8400	Equation for Calculation of HRVs for Carcinogens.
4717.8450	Equation for Calculation of mHRVs for Carcinogens.
4717.8500	Equations for Calculation of HRVs for Acute Toxicity.
4717.8550	Procedure for Determining Cancer Index for Simultaneous Exposure to Multiple Carcinogens.
4717.8600	Procedure for Determining Hazard Index for Assessing Simultaneous Exposure to Multiple Toxicants with Noncarcinogenic Effects.