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
- Hot Spots Unit Risk and Cancer Potency Values
- Acute, 8-hour, and Chronic Reference Exposure Level (RELs)
Current Hot Spots Guidelines Technical Support Documents
Hot Spots Reports, Notices and Documents
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.
Jun 2, 2010: Notice of Public Workshops on Proposed Reference Exposure Levels for Methylene Diphenyl Diisocyanate, Toluene Diisocyanate, and Caprolactam
OEHHA announced public workshops for RELs for MDI, TDI, and caprolactam.
May 20, 2010: Notice of Public Comment for Proposed Reference Exposure Levels for Caprolactam
OEHHA released for public comment its proposed Caprolactam RELs.
Apr 23, 2010: Notice of Public Comment for Proposed Revised Reference Exposure Levels for Toluene Diisocyanate and Methylene Diphenyl Diisocyanate
OEHHA released for public comment its proposed Revised Reference Exposure Levels for Toluene Diisocyanate and Methylene Diphenyl Diisocyanate.
Aug 7, 2009: Notice of Public Comment for Revisions to TSD for Cancer Potency Factors Appendix C - Use of Toxicity Equivalence Factors Scheme for Estimating Toxicity of Mixtures of Dioxin-like Chemicals
OEHHA released proposed revisions to its Technical Support Document for Cancer Potency Factors Appendix C - Use of Toxicity Equivalence Factors Scheme for Estimating Toxicity of Mixtures of Dioxin-...
Jun 1, 2009: Technical Support Document for Cancer Potency Factors 2009
Current Technical Support Document for Hot Spots Cancer Potency Factors