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In page Perfluorooctanesulfonic acid:

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Using information gained through a Freedom of Information Act request, in May 2018 it became public that January 2018 emails between the EPA, the White House, and the Department of Health and Human Services showed a discussion on PFOS. The emails showed a decision to withhold results of a study of PFOS done by the Agency for Toxic Substances and Disease Registry. That study was planned for publication. The study shows that PFOS endangers human health at a lower level. That lower level, the EPA previously determined was safe.[8]