About the Exposure Factors Program

The development of the latest version of the Exposure Factors Handbook (EFH): 2011 Edition (EPA/600/R-09/052F) has maintained the need for a more comprehensive program that addresses issues related to exposure factors. Since the first version of the EFH was released in 1997, the need for the most up-to-date and accurate data on exposure factors used in assessing exposure to contaminants in the environment is of high priority to exposure assessors throughout the U.S. The completion of the 2011 edition of the Exposure Factors Handbook has only been the first step in fulfilling this need. Many data needs have been identified and follow up research is underway to address some of the data gaps. This web page is intended to provide a "one-stop-shop" where the most current information and data on exposure factors can be found.


May 1989EPA released the first Exposure Factors Handbook (Final Report) (EPA/600/8-89/043).
Aug 1997EPA released an updated Exposure Factors Handbook (Final Report) (EPA/600/P-95/002F, A-C, 1997).
Jul 2000EPA released the report, Exposure Factors Distributions (based on the 1997 Handbook).
Apr 2001EPA released the Factor Finder CD-ROM (based on the 1997 Handbook).
Sep 2003EPA released the report, CSFII Analysis of Food Intake Distributions (based on the 1997 Handbook).
Sep 2004EPA released the Example Exposure Scenarios Tool.
Nov 2005EPA released the report, Guidance on Selecting Age Groups for Monitoring and Assessing Childhood Exposures to Environmental Contaminants (EPA/630/P-03/003F).
Mar 2007EPA released the report, Analysis of Fat Intake Based on the U.S. Department of Agriculture's 1994-96, 1998 Continuing Survey of Food Intakes By Individuals (CSFII) (EPA/600/R-05/021).
Oct 2008EPA released the report, Child-Specific Exposure Factors Handbook (EPA/600/R-06/096F).
Jun 2009EPA released the report, Metabolically Derived Human Ventilation Rates: A Revised Approach Based Upon Oxygen Consumption Rates (EPA/600/R-06/129F).
Oct 2009EPA released the Highlights of the Child-Specific Exposure Factors Handbook (EPA/600/R-08/135).
Oct 2011EPA released the updated report, Exposure Factors Handbook: 2011 Edition (EPA/600/R-09/052F). This is the latest version.
Nov 2011EPA released the Highlights of the Exposure Factors Handbook (EPA/600/R-10/030).