About the Exposure Factors Program

Since the first version of the EFH was released in 1989, 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. In October 2017, EPA released the first chapter update, Chapter 5:Soil and Dust Ingestion with the latest data available (see Downloads for this latest version).


The Exposure Factors Handbook provides a summary of the available statistical data on various factors used in assessing human exposure including drinking water consumption, soil ingestion rates, inhalation rates, dermal factors including skin area and soil adherence factors, consumption of fruits and vegetables, fish, meats, dairy products, homegrown foods, breast milk intake, human activity factors, consumer product use, and residential characteristics. The development of the Exposure Factors Handbook has brought to light the importance of the availability of the most up-to-date and accurate data on exposure factors used in assessing exposure to contaminants in the environment. During the preparation of the Exposure Factors Handbook, many data gaps were identified. In order to fulfill those data gaps further research was necessary. Results from this research will assist in keeping the Handbook updated and is the basis of the EPA Exposure Factors Program.

This site is intended to provide a "one-stop-shop" where the most current results from the EPA Exposure Factors Program can be found.

Most materials are found also under the EPA ExpoBox Application at https://www.epa.gov/expobox


Date Description
01-May 1989EPA released the first Exposure Factors Handbook (Final Report) (EPA/600/8-89/043).
02-Aug 1997EPA released an updated Exposure Factors Handbook (Final Report) (EPA/600/P-95/002F, A-C, 1997).
03-Jul 2000EPA released the report, Exposure Factors Distributions (based on the 1997 Handbook).
04-Apr 2001EPA released the Factor Finder CD-ROM (based on the 1997 Handbook).
05-Sep 2003EPA released the report, CSFII Analysis of Food Intake Distributions (based on the 1997 Handbook).
06-Sep 2004EPA released the Example Exposure Scenarios Tool.
07-Nov 2005EPA released the report, Guidance on Selecting Age Groups for Monitoring and Assessing Childhood Exposures to Environmental Contaminants (EPA/630/P-03/003F).
08-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).
09-Oct 2008EPA released the report, Child-Specific Exposure Factors Handbook (EPA/600/R-06/096F).
10-Jun 2009EPA released the report, Metabolically Derived Human Ventilation Rates: A Revised Approach Based Upon Oxygen Consumption Rates (EPA/600/R-06/129F).
11-Oct 2009EPA released the Highlights of the Child-Specific Exposure Factors Handbook (EPA/600/R-08/135).
12-Oct 2011EPA released the updated report, Exposure Factors Handbook: 2011 Edition (EPA/600/R-09/052F). This is the latest version.
13-Nov 2011EPA released the Highlights of the Exposure Factors Handbook (EPA/600/R-10/030).
14-Oct 2017EPA released the Update for Chapter 5 of the Exposure Factors Handbook: Soil and Dust Ingestion (EPA/600/R-17/384F).