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

May 21, 2015: Draft Reference Exposure Levels for Carbonyl Sulfide
After a comment period where no comments were received, OEHHA released its updated draft Reference Exposure Levels for carbonyl sulfide for its upcoming Scientific Review Panel meeting.
May 20, 2015: Proposed Reference Exposure Levels for Toluene Diisocyanate and Methylene Diphenyl Diisocyanate – SRP Drafts 2015
OEHHA released revised drafts of its Reference Exposure Levels for Toluene Diisocyanate and Methylene Diphenyl Diisocyanate, which reflected updates requested by the Scientific Review Panel.
Mar 6, 2015: Notice of Adoption of Air Toxics Hot Spots Program Guidance Manual for the Preparation of Health Risk Assessments 2015
Current Air Toxics Hot Spots Program Guidance Manual for Preparation of Health Risk Assessments
Nov 14, 2014: Proposed Reference Exposure Levels for Toluene Diisocyanate and Methylene Diphenyl Diisocyanate – SRP Drafts
OEHHA released drafts of its proposed Reference Exposure Levels for toluene diisocyanate and methylene diphenyl diisocyanate for review by the Scientific Review Panel prior to its meeting. 
Oct 17, 2014: Notice of Public Comment/Workshops for Draft Reference Exposure Levels for Carbonyl Sulfide
OEHHA released its draft RELs for Carbonyl Sufide for public comment, and held supporting workshops.
Oct 14, 2014: Draft Air Toxics Hot Spots Program Guidance Manual for the Preparation of Risk Assessments for the Scientific Review Panel Oct 2014
OEHHA released a draft version of the Air Toxics Hot Spots Program Guidance Manual for the Preparation of Risk Assessments for the Scientific Review Panel, incorporating adjustments made after public...
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.

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