Air Toxics Hot Spots

The Air Toxics "Hot Spots" Information and Assessment Act (AB 2588, Connelly) was enacted in 1987, and requires stationary sources of pollutants to report the types and quantities of certain substances routinely released into the air. The goals of the Air Toxics "Hot Spots" Act are to collect emission data, to identify facilities having localized impacts, to ascertain health risks, to notify nearby residents of significant risks, and to reduce those significant risks to acceptable levels.

Guideline Values for Health Risk Assessment

Current Hot Spots Guidelines Technical Support Documents

: Inhalation Unit Risk Factor (IUR) for Acrolein
OEHHA is releasing a draft document for public review that summarizes the carcinogenicity data and derives a cancer inhalation unit risk factor (IUR) for acrolein.
: Inhalation Unit Risk Factor (IUR) for Ethylene Oxide
OEHHA is releasing a draft document for public review that summarizes the carcinogenicity data and derives an updated cancer inhalation unit risk factor (IUR) for ethylene oxide.
: Reference Exposure Levels (RELs) for 1,4-Dichlorobenzene
The Office of Environmental Health Hazard Assessment (OEHHA) is announcing the availability of a draft document for public review summarizing the noncancer reference exposure levels (RELs) for 1…
: Notice of Adoption of Cancer Inhalation Unit Risk Factor for Isoprene
The Office of Environmental Health Hazard Assessment (OEHHA) is adopting a new cancer inhalation Unit Risk Factor (IUR) for Isoprene.
: Notice of Adoption of Reference Exposure Levels for Trimethylbenzenes
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…
: Notice of Adoption of Revised Cancer Inhalation Unit Risk Factors for Cobalt Sulfate Heptahydrate and Water-Soluble Cobalt Compounds
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…
: Notice Of Extension Of The Public Comment Period On A Draft Cancer Inhalation Unit Risk Factor For Ethylene Oxide
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…
: Notice of Adoption of Reference Exposure Levels for 1-Bromopropane
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…
: Notice of Adoption of Cancer Inhalation Unit Risk and Slope Factors for 1-Bromopropane
The Office of Environmental Health Hazard Assessment (OEHHA) is adopting new cancer inhalation unit risk (IUR) and slope factors for 1-Bromopropane (1-BP) for use in the Air Toxics Hot Spots Program.
: Chromium, Trivalent (Inorganic Water-Soluble Compounds)
The Office of Environmental Health Hazard Assessment (OEHHA) is adopting new Reference Exposure Levels (RELs) for Chromium, Trivalent (Inorganic Water-Soluble Compounds) (Cr(III)) for use in the Air…