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The Office of Environmental Health Hazard Assessment is adopting revised cancer inhalation unit risk (IUR) and slope factors for cobalt and water-soluble cobalt compounds for use in the Air Toxics Hot Spots program for use in the Air Toxics Hot Spots Program.

The Office of Environmental Health Hazard Assessment is adopting new Reference Exposure Levels for 1-Bromopropane for use in the Air Toxics Hot Spots Program. Reference Exposure Levels are airborne concentrations of a chemical that are not anticipated to result in adverse noncancer health effects for specified exposure durations in the general population, including sensitive subpopulations. 

The Office of Environmental Health Hazard Assessment is announcing the webcast option for the Northern California Public Workshop on releasing a draft document for public review that summarizes the carcinogenicity data and derives an updated cancer inhalation unit risk factor for ethylene oxide. At the request of the American Chemistry Council, OEHHA hereby extends the public comment period. The public comment period will now close on Wednesday, June 14, 2023. 

The Office of Environmental Health Hazard Assessment is adopting new Reference Exposure Levels for Trimethylbenzenes for use in the Air Toxics Hot Spots Program. Reference Exposure Levels are airborne concentrations of a chemical that are not anticipated to result in adverse noncancer health effects for specified exposure durations in the general population, including sensitive subpopulations.