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

Hot Spots Reports, Notices and Documents

Mar 9, 2012: Draft Technical Support Document for Exposure Assessment and Stochastic Analysis Mar 2012
OEHHA released a draft of the Air Toxics Hot Spots Program Risk Assessment Guidelines: Technical Support Document for Exposure Assessment and Stochastic Analysis for review by the Scientific Review...
Jan 6, 2012: Extension of Public Comment Period for Draft Technical Support Document for Exposure Assessment and Stochastic Analysis Jan 2012
OEHHA extended the comment period for the Air Toxics Hot Spots Program Technical Support Document For Exposure Assessment and Stochastic Analysis.
Nov 7, 2011: Notice of Public Comment/Workshops for the Draft Technical Support Document for Exposure Assessment and Stochastic Analysis Nov 2011
OEHHA released for public comment the Air Toxics "Hot Spots" Program Risk Assessment Guidelines: Technical Support Document for Exposure Assessment and Stochastic Analysis.
Apr 1, 2011: Proposed Revised Reference Exposure Levels for Caprolactam and Nickel
OEHHA released revised draft Reference Exposure Levels for Caprolactam and Nickel for review by the Scientific Review Panel.
Jan 31, 2011: Adoption of Revised Toxicity Equivalency Factors for TEF(WHO-05) for PCDDs, PCDFs, and Dioxin-like PCBs
OEHHA adopted revised toxicity equivalency factors for polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs), and for dioxin-like polychlorinated biphenyls (PCBs) to conform to the most...
Dec 27, 2010: Meeting of the Scientific Review Panel for Toxic Air Contaminants on January 21, 2011
The Scientific Review Panel on Toxic Air Contaminants met to review OEHHA's draft documents on the Use of the Toxicity Equivalency Factor (TEFWHO‑97 and TEFWHO‑05) Scheme for Estimating Toxicity of...
Jun 17, 2010: Extension of Public Comment Period for Proposed Revised Reference Exposure Levels For Toluene Diisocyanate And Methylene Diphenyl Diisocyanate
OEHHA extended the public comment period for its proposed revised Reference Exposure Levels for Toluene Diisocyanate and Methylene Diphenyl Diisocyanate after a request from an interested party.
Jun 4, 2010: Notice of Public Comment on Proposed Revised Reference Exposure Levels for Nickel and Nickel Compounds
OEHHA released for public comment its proposed revision to the Reference Exposure Levels for nickel and nickel compounds.
May 20, 2010: Notice of Public Comment for Proposed Reference Exposure Levels for Caprolactam
OEHHA released for public comment its proposed Caprolactam RELs.

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