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