Minnesota Public Radio slideshow:
The long reach of perfluorochemicals
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John Giesy of Michigan State University researched the presence of PFOS in the environment. This map shows where aquatic mammals have been found to have PFOS in their systems. The dark blue indicates levels of the substance in the liver, and the light blue in blood plasma. (Image courtesy of Prof. John Giesy, Michigan State University)

John Giesy of Michigan State University researched the presence of PFOS in the environment. This map shows where aquatic mammals have been found to have PFOS in their systems. The dark blue indicates levels of the substance in the liver, and the light blue in blood plasma.

(Image courtesy of Prof. John Giesy, Michigan State University)
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