Perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) are the most abundant perfluoronated chemicals (PFCs) in the United States. Together PFOS and PFOA are sometimes referred to as PFCs, or C8 compounds. These substances are not naturally occurring. Humans and our manufacturing processes create them. They are as widespread as polychlorinated biphenyls (PCBs), and, some experts believe, are an equally serious environmental issue.
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