Consolidated Table of OEHHA / ARB Approved Risk Assessment Health Values

This page last reviewed August 26, 2015

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 call the Emission Assessment Branch of the Stationary Source Division at (916) 322-1617 or send email in care of YanPing Zuo.

All tables are in Adobe Acrobat format:
  • On June 27, 2014, OEHHA adopted a new 8-hour REL and revised acute and chronic RELs for benzene. The REL values and summary 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 163 KB, May 13, 2015.  When printing document, use legal-size paper.)  Updated the footnotes of Molecular Weight Adjustment Factor, asbestos, and selenium and compounds.

  • 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 179KB, July 3, 2014)

For more information see: