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

: 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. 
: 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.
: 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. 
: 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.
: 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
: 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…
: 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.
: 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.
: 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…
: 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.