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EPA reviews Univ. of Michigan dioxin study
Date:10/1/2009

(CHICAGO - Sept. 30, 2009) U.S. Environmental Protection Agency's Office of Research and Development has completed its review of a dioxin exposure study conducted by the University of Michigan in the Midland-Saginaw, Michigan area. EPA found the study was conducted well and provided useful, scientifically credible information. However, the study is of limited value to help EPA fully evaluate human exposure to levels of dioxin in the Tittabawassee River and Saginaw River and Bay.

EPA's review was conducted under the dioxin science plan announced by Administrator Lisa P. Jackson this past May. The University of Michigan Dioxin Exposure Study (UMDES) was conducted in response to community concerns that dioxin compounds from the Midland-based Dow Chemical Co. had contaminated the city and surrounding areas. The University received financial support for the UMDES from Dow through an unrestricted grant. Primary data collection was completed in 2004-2005 and the analysis of study results continues.

EPA's review identified several significant issues that limit the utility of the UMDES results:

The study did not include children, who tend to have higher exposures to contaminants because they have more contact with, and ingestion, of soils and dusts.

It is unclear if the study included a sufficient number of properties with highly-contaminated soils. Such properties can be found in the Midland-Saginaw area.

It is uncertain how well the study represented people who participate in activities that could lead to elevated dioxin exposures, such as eating local fish and game with elevated dioxin levels.

Additionally, the UMDES included no health status information on the people surveyed. Thus, the UMDES data do not support analysis of the association between dioxin blood levels and possible health effects. Understanding these issues is critical when evaluating associations between exposure and blood dioxin levels in sensitive popu
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Contact: Mick Hans
hans.mick@epa.gov
312-353-5050
U.S. Environmental Protection Agency
Source:Eurekalert

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