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

Aug 22, 2014: Extension of Public Comment Period for Proposed Revised Reference Exposure Levels For Toluene Diisocyanate And Methylene Diphenyl Diisocyanate 2014
OEHHA extended the public comment period for its Proposed Revised Reference Exposure Levels for Toluene Diisocyanate and Methylene Diphenyl Diisocyanate.
Jul 28, 2014: Extension of Public Comment Period on Draft Air Toxics Hot Spots Program Guidance Manual for the Preparation of Risk Assessments
OEHHA extended the public comment period on its Air Toxics Hot Spots Program Guidance Manual for the Preparation of Risk Assessments.
Jul 4, 2014: Notice of Public Comment/Workshops for Proposed Revised Reference Exposure Levels for Toluene Diisocyanate and Methylene Diphenyl Diisocyanate
OEHHA released for public comment its draft Reference Exposure Levels for Toluene Diisocyanate and Methylene Diphenyl Diisocyanate, and held accompanying workshops.
Jun 27, 2014: Notice of Adoption of Revised Reference Exposure Levels for Benzene
OEHHA adopted its revised Reference Exposure Levels for Benzene after approval by the Scientific Review Panel.
Jun 20, 2014: Notice of Public Comment for Draft Air Toxics Hot Spots Program Guidance Manual for the Preparation of Risk Assessments 2014
OEHHA released a draft version of the Air Toxics Hot Spots Program Guidance Manual for the Preparation of Risk Assessments for public comment, and held accompanying workshops.
Jan 22, 2014: Proposed Revised Reference Exposure Levels for Benzene
OEHHA released an updated version of its proposed revised Reference Exposure Levels for benzene reflecting comments received from the public and the Scientific Review Panel.
Oct 18, 2013: Notice of Adoption of Reference Exposure Levels for Caprolactam
OEHHA adopted Reference Exposure Levels for Caprolactam following approval by the Scientific Review Panel in 2011. 
Jul 26, 2013: Notice of Adoption of Revised Reference Exposure Levels for 1,3-Butadiene
OEHHA adopted a revision of its Reference Exposure Levels for 1,3-butadiene after approval by the Scientific Review Panel.
Jun 21, 2013: Notice of Public Comment/Workshop on Proposed Revised Reference Exposure Levels for Benzene
OEHHA released its Proposed Revised Reference Exposure Levels for Benzene for public comment, and held supporting workshops. 
Sep 11, 2012: Revised Proposed Reference Exposure Levels for 1,3-Butadiene
OEHHA released a revised draft of its proposed Reference Exposure Levels for 1,3-butadiene after receiving public comments, and wrote responses to these comments.

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