OAR 340-245-0310: Process for Updating Risk-Based Concentrations for Toxic Air Contaminants

(1) Purpose. As risk assessment and toxicological sciences advance, it is important that health risk-based standards for air quality continue to reflect the latest practices and science. The list of toxic air contaminants that are regulated and their RBCs represent one area where regulations will need regular updating to accommodate advancing science and practices to ensure that impacts to public health from industrial air emissions are minimized. (2) Process for updating risk-based concentrations. (a) DEQ will propose, through a public rulemaking process , to revise, add, or remove risk-based concentrations for toxic air contaminants whenever changes are proposed to their toxicity reference values in OAR 340-247-8010 Table 2. (b) As needed, DEQ will propose, through a public rulemaking process , to revise risk-based concentrations if new information indicates the need to adjust exposure factors or other adjustment factors for individual toxic air contaminants or groups of toxic air contaminants.