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

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
Apr 29, 2009: Meeting of the Scientific Review Panel for Toxic Air Contaminants on May 12, 2009
The Scientific Review Panel for Toxic Air Contaminants met to review OEHHA's revised Technical Support Document for Cancer Potency Factors.
Nov 25, 2008: Meeting of the Scientific Review Panel for Toxic Air Contaminants on December 5, 2008
The Scientific Review Panel for Toxic Air Contaminants reviewed OEHHA's draft Reference Exposure Level documents for acetaldehyde, acrolein, arsenic, formaldehyde, manganese, and mercury, as well as...
Oct 10, 2008: Meeting of the Scientific Review Panel for Toxic Air Contaminants on October 30, 2008
The Scientific Review Panel for TACs discussed OEHHA's updated draft of the Technical Support Document for Cancer Potency Factors and the documentation for proposed new RELs for acetaldehyde,...
Jul 18, 2008: Draft Technical Support Document for Noncancer Risk Assessment Jul 2008
OEHHA released a revised draft of the Technical Support Document for Noncancer Risk Assessment, reflecting discussion that took place at the June 2008 SRP meeting. 
Jun 20, 2008: Notice of Public Comment/Workshops for Draft Technical Support Document for Cancer Potency Factors 2008
OEHHA released for public comment a draft of Technical Support Document for Cancer Potency Factors. 
Jun 12, 2008: Draft Technical Support Document for Noncancer Risk Assessment Jun 2008
OEHHA released a revised draft of the Technical Support Document for Noncancer Risk Assessment, which reflects responses to comments posed in the May 2008 SRP meeting, as well as a revised manganese...

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