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Air Toxicology and Epidemiology

Air Toxics Hot Spots Program Risk Assessment Guidelines. Part II. Technical Support Document for Describing Available Cancer Potency Factors
[12/19/02]

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The Technical Support Document for Describing Available Cancer Potency Factors (TSD) contains cancer unit risks and potency factors for 121 of the 201 carcinogenic substances or groups of substances for which emissions must be quantified in the Air Toxics Hot Spots program. The purpose of this document is to provide a summary of the data supporting the carcinogenic potential of the substance or group of substances and to provide the calculation procedure used to derive the estimated unit risk and cancer potency factors.

This document has been revised from the April 1999 version. The changes from the earlier version are primarily errata corrections. Additionally, a cancer unit risk factor and supporting chemical summary data for methyl tert-butyl ether (MTBE) were added to the document. The cancer unit risk for MTBE underwent public and peer review, and was approved by the Scientific Review Panel (SRP) of the Air Resources Board (ARB) on November 19, 1999.

Download the document in PDF format.

Download ONLY the table of Hot Spots Unit Risks and Cancer Potency Values.

Download ONLY Appendix I (Additions and Corrections from the Last Document Version).

Appendix A was updated on August 29, 2003.
Follow this link to download the revised toxicity equivalency factors for PCDDs, PCDFs, and Dioxin-Like PCBs.