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 24, 2008: Draft Technical Support Document for Noncancer Risk Assessment Apr 2008
OEHHA released a revised draft of the Technical Support Document for Noncancer Risk Assessment which reflects new data and comments from the public and Scientific Review Panel.
Dec 19, 2007: Extension of Public Comment Period on Draft Air Toxics Hot Spots Program Technical Support Document for Noncancer Risk Assessment Dec 2007
OEHHA extended the public comment period for its draft Air Toxics Hot Spots Program Technical Support Document For the Derivation of Noncancer Reference Exposure Levels.
Nov 14, 2007: Adoption of a Unit Risk Value for Ethylbenzene
OEHHA adopted a unit risk value and an inhalation cancer potency value for ethylbenzene, for estimating cancer risk associated with inhalation exposures.
Nov 2, 2007: Notice of Public Comment Period/Workshops on Draft Air Toxics Hot Spots Program Technical Support Document for Noncancer Risk Assessment Nov 2007
OEHHA released a draft of the Air Toxics Hot Spots Program Technical Support Document For the Derivation of Noncancer Reference Exposure Levels, intended to replace two prior technical support...
May 31, 2005: Adopted Air Toxics "Hot Spots" Program Risk Assessment Guidelines Part II 2005
The Scientific Review Panel adopted OEHHA's Air Toxics "Hot Spots" Program Risk Assessment Guidelines Part II: Technical Support Document for Describing Available Cancer Potency Factors.
Feb 10, 2005: Adoption of Chronic Reference Exposure Levels for Silica (Crystalline, Respirable)
OEHHA adopted Chronic Reference Exposure Levels for silica (crystalline, respirable) after approval of its document by the Scientific Review Panel.
Mar 18, 2004: Draft Chronic Reference Exposure Levels for Silica (Crystalline, Respirable)
In response to public comments, OEHHA released a revised version of its draft Chronic Reference Exposure Levels for silica (crystalline, respirable).
Oct 3, 2003: Notice of Adoption of Air Toxics Hot Spots Program Guidance Manual for Preparation of Health Risk Assessments 2003
OEHHA adopted the Air Toxics Hot Spots Program Guidance Manual for Preparation of Health Risk Assessments following public comment, workshops, and approval by the State's Scientific Review Panel on...
Aug 29, 2003: Adoption of Revised Toxicity Equivalency Factors (TEF WHO-97) for PCDDs, PCDFs, and Dioxin-Like PCBs
OEHHA adopted revised Toxicity Equivalency Factors (TEF WHO-97) for PCDDs, PCDFs, and Dioxin-Like PCBs. 
May 16, 2003: Notice of Extension of Public Comment/Workshops on Chronic Toxicity Summary for Silica (Crystalline, Respirable)
OEHHA extended the public comment period and held workshops for its Chronic Toxicity Summary for silica (crystalline, respirable). 

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