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

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.
Aug 27, 2012: Notice of Adoption of Technical Support Document for Exposure Assessment And Stochastic Analysis Aug 2012
Current Exposure Assessment Guidelines: Technical Support Document for Exposure Assessment and Stochastic Analysis
Jun 21, 2012: Draft Technical Support Document for Exposure Assessment and Stochastic Analysis June 2012
OEHHA released a second draft of Air Toxics Hot Spots Program Risk Assessment Guidelines: Technical Support Document for Exposure Assessment and Stochastic Analysis for review by the Scientific...
May 18, 2012: Notice of Public Comment/Workshops on Proposed Revised Reference Exposure Levels for 1,3-Butadiene
OEHHA released its proposed revised Reference Exposure Levels for 1,3-butadiene for public comment, and held supporting workshops.
Mar 23, 2012: Notice of Adoption of Revised Reference Exposure Levels for Nickel and Nickel Compounds
OEHHA announced its revised Reference Exposure Levels for nickel and nickel compounds following its approval by the Scientific Review Panel.

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