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

Apr 25, 2003: Notice of Public Comment/Workshops for Draft Chronic Toxicity Summary for Silica (Crystalline, Respirable)
OEHHA released a draft Chronic Toxicity Summary for Silica (Crystalline, Respirable) for public comment, and held supporting workshops. 
Jan 3, 2003: Notice of Public Comment/Workshop on Proposed Revised Toxicity Equivalency Factors (TEF WHO-97) for PCDDs, PCDFs, and Dioxin-Like PCBs
OEHHA released for public comment its Proposed Revised Toxicity Equivalency Factors (TEF WHO-97) for PCDDs, PCDFs, and Dioxin-Like PCBs, and held a workshop in support of that effort.
Dec 19, 2002: Draft Air Toxics "Hot Spots" Program Risk Assessment Guidelines Part II 2002
OEHHA released a draft version of the Air Toxics "Hot Spots" Program Risk Assessment Guidelines Part II: Technical Support Document for Describing Available Cancer Potency Factors. 
Jun 6, 2002: Notice of Public Comment/Workshop for Draft Air Toxics Hot Spots Guidance Manual for Preparation of Health Risk Assessments 2002
OEHHA released for public comment its Draft Air Toxics Hot Spots Program Guidance Manual for the Preparation of Risk Assessments, and held accompanying workshops.
Dec 28, 2001: Notice of Adoption of 12 Chronic Reference Exposure Levels (RELs) for Airborne Toxicants, Dec 2001
Following their endorsement by the Scientific Review Panel, OEHHA adopted 12 Chronic Reference Exposure Levels, the fourth such wave accompanying the Air Toxics Hot Spots Program Risk Assessment...
Jan 22, 2001: Notice of Adoption of 2nd Set of 22 Chronic Reference Exposure Levels (RELs) for Airborne Toxicants, Jan 2001
After endorsement by the Scientific Review Panel, OEHHA adopted chronic Reference Exposure Levels for 22 chemicals.  This was the third such wave to accompany the Air Toxics Hot Spots Program Risk...
Oct 27, 2000: Notice of Adoption of the Air Toxics "Hot Spots" Program Risk Assessment Guidelines Part IV Oct 2000
OEHHA released the final document, "Air Toxics Hot Spots Program Risk Assessment Guidelines Part IV: Exposure Assessment and Stochastic Analysis Technical Support Document."
May 2, 2000: Notice of Adoption of 16 Chronic Reference Exposure Levels (RELs) for Airborne Toxicants, May 2000
Following endorsement by the Scientific Review Panel, OEHHA adopted Chronic Reference Exposure Levels for 16 chemicals.  This was the 2nd wave included with the Air Toxics Hot Spots Program Risk...
Mar 10, 2000: Notice of Public Comment Period on Draft Air Toxics "Hot Spots" Program Risk Assessment Guidelines Part IV Mar 2000
OEHHA released for public comment the Air Toxics "Hot Spots" Program Risk Assessment Guidelines Part IV: Exposure Assessment and Stochastic Analysis Technical Support Document.
Feb 23, 2000: Notice of Adoption of Air Toxics "Hot Spots" Program Risk Assessment Guidelines Part III and 22 Chronic RELs
Following approval by the Scientific Review Panel, OEHHA adopted the Air Toxics "Hot Spots" Program Risk Assessment Guidelines Part III, and 1st set of 22 chronic RELs.

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