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Risk Assessment

Exposure Factors Handbook 2009 Update (External Review Draft)

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Archived files are provided for reference purposes only. The file was current when produced, but is no longer maintained and may now be outdated. Persons with disabilities having difficulty accessing archived files may contact the NCEA Webmaster for assistance. Please visit http://epa.gov/ncea to access current information.

Report Information

The mission of National Center for Environmental Assessment (NCEA) of EPA's Office of Research and Development is to provide guidance and risk assessments aimed at protecting human health and the environment. To accomplish this mission, NCEA works to develop and improve the models, databases, tools, assumptions, and extrapolations used in risk assessments. This handbook is a tool developed by NCEA aimed at refining the assumptions used in exposure assessments and reducing uncertainty. This handbook was first published in 1989 and updated in 1997 to provide statistical data on the various human factors used in assessing exposure. This revised version of the handbook provides the up-to-date data on these exposure factors. The recommended values are based solely on our interpretations of the available data. In many situations different values may be appropriate to use in consideration of policy, precedent or other factors.

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Jacqueline Moya
  • by phone at:   703-347-8539
  • by email at:  moya.jacqueline@epa.gov


May 1989EPA released the Exposure Factors Handbook (Final Report) 1989. EPA/600/8-89/043.
Aug 1996EPA released the draft Exposure Factors Handbook for public review and comment.
Aug 1997EPA released the Final Exposure Factors Handbook.
Oct 2009EPA released the draft report for a 60-day public review and comment period.
Sep 2011EPA released the final report, Exposure Factors Handbook: 2011 Edition. [Federal Register Notice Oct 3, 2011]
Jul 2012EPA released the comments from the peer review workshop.

Additional Information

Comments on the assessment may be submitted and reviewed using the e-Government Regulations.gov Web site. From the site, select Environmental Protection Agency and the keyword EPA-HQ-ORD-2009-0613 (for the docket ID) to comment on this report.


U.S. EPA. Exposure Factors Handbook 2009 Update (External Review Draft). U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-09/052A, 2009.


This download(s) is distributed solely for the purpose of pre-dissemination peer review under applicable information quality guidelines. It has not been formally disseminated by EPA. It does not represent and should not be construed to represent any Agency determination or policy.

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