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U.S. EPA (Environmental Protection Agency). (2005) Guidance on selecting age groups for monitoring and assessing childhood exposures to environmental This updated edition of the handbook provides the most up-to-date data on the various human factors used in assessing exposure. The Exposure Factors Handbook ( Exposure Factors Handbook: 2011 Edition. The Exposure Factors Handbook provides information on various physiological and behavioral factors commonly used in EPA/540/1-89/002. U.S. EPA 1990. Exposure Factors Handbook. Office of Health and Environmental Assessment. EPA / 8-89 / 043, March 1990. U.S. EPA 1991a.