Environmentalists are criticizing the EPA's decision to set the limit on acceptable short-term exposure to perfluorooctanoic acid at 0.4 parts per billion, saying the agency failed to consider that drinking-water exposure of PFOA produces a hundredfold concentration of the chemical in human blood. An EPA official said he expects the agency and policymakers to continue to examine the issue and that with the science that is currently available, the level is appropriate.

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