Air Toxics Hot Spots Program

Note The souree for the above risk values is Table III-7, Preliminary Caneer Poteuey Values for Uie Air Toxies Hot Spots aet, found in California Air Pollution Control Offieers Assoeiation, Air Toxics Hot Spots Program, Revised 1192 Risk Assessment Guidelines," page III-28, published Oetober 1993. 

California Air Resources Board/Office of Environmental Health Hazard Assessment, Benzol a] pyrene as a Toxic Air Contaminant (1994) Office of Environmental Health Hazard Assessment/California Environmental Protection Agency, Air Toxics Hot Spot Program Risk Assessment Guideline, Part II Technical Support Document for Describing Available Cancer Potency Factors (1998) Collins et al. (1998). 

Office of Environmental Health Hazard Assessment, California Environmental Protection Agency, Air Toxics Hot Spot Program Risk Assessment Guideline Part II Technical Support Document for Describing Available Cancer Potency Factors, 1998. 

RELs). The Air Toxics Hot Spots Program Risk Assessment Guidelines, Part 1 The Determination of Acute Reference Exposure Levels for Airborne Toxicants, March 1999 and the Air Toxics Hot Spots Program Risk Assessment Guidelines, Part III The Determination of Chronic Reference Exposure Levels for Airborne Toxicants, www.oehha.ca.gov/air/allrels.html (accessed 11 May 2009). 

CARB (1999) Air toxics emissions data collected in the Air Toxics Hot Spots Program CEIDARS Database as of January 29. 

Chronic exposure to dioxins has resulted in splenic and testicular atrophy, elevated gamma-glutamyl transpeptidase levels, elevated cholesterol levels, and abnormal neurologic findings. Additional effects include enzyme induction, diabetes, and endocrine changes. The chronic, noncancer reference exposure level of 3.5 xl0 pgm is listed for TCDD or 2,3,7,8-equivalents by the California Air Pollution Control Officers Association Air Toxics Hot Spots Program. 

ARB (2008b). AB 2588 Air Toxics Hot Spots Program. Air Resources Board, California Environmental Protection Agency, Sacramento, CA. Accessed at http //www.arb.ca.gov/ab2588/ab2588.htm. 

Emissions from individual sources can be closely regulated, both within a facility (occupational standards) and outside it (with New Source Performance Standards at the federal level and/or Air Toxic Hot Spots regulations in California). The National Institute of Occupational Safety and Health (NIOSH) began in 1970, with the passage of the Occupational Safety and Health Act, to develop recommended exposure limits (RELs) for chemicals in the workplace. In 1974, NIOSH joined with OSHA to update the OSHA program for PELs for a wide variety of substances, incorporating cancer potency data as it became available over subsequent years. Their evaluations were published in criteria documents. Special Hazard Reviews, and summarized in a Compendium of Policy Documents and Statements (NIOSH 1992). Available information is periodically updated in the NIOSH Pocket... 

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