Consolidated Table of OEHHA / ARB Approved Risk Assessment Health Values

This page last reviewed August 20, 2018

The Consolidated Table of OEHHA / ARB Approved Risk Assessment Health Values is a quick look-up table of all cancer potency values and noncancer acute, 8-hour, and chronic Reference Exposure Levels (RELs) that are available for use in the AB 2588 Air Toxics "Hot Spots" Program.  The most current health values should be used for the development of a facility health risk assessment.  For more information on the OEHHA Guidelines, see the OEHHA website.  Users of this table are advised to monitor the OEHHA website for any updates to the health values. If you have any questions, please send an email to the Risk Reduction Branch of the Transportation and Toxics Division in care of HARP.

All tables are in Adobe Acrobat format:
  • On August 16, 2018 OEHHA adopted an inhalation cancer unit risk factor (URF), inhalation cancer potency factor, and oral cancer potency value for tertiarty-butyl acetate (TBAc).  Although OEHHA has adopted an oral cancer potency value for tertiary-butyl acetate, its chemical/biological properties do not fit the multipathway scheme.  Therefore, non-inhalation pathway risks calculated from this value will be zero because the transfer factors are set to zero.  Please contact OEHHA for more information.  The values can be found at:

  •  Consolidated Table of OEHHA/ARB Approved Risk Assessment Health Values: Lists all of the Health Values that have been approved for use in facility health risk assessments.  (contable.pdf, PDF 278 KB, August 20, 2018.  When printing document, use legal-size paper.) 

  • Target Organs Tables: List the Acute, 8-Hour, and Chronic Noncancer Reference Exposure Levels that have been adopted by OEHHA and the chemicals target organs. (totables.pdf, PDF 299 KB, May 8, 2018)

For more information see: