Per- and polyfluoroalkyl substances (PFAS) are a group of over 4,000 different man-made chemicals that include PFOA (perfluorooctanoic acid), PFOS (perfluorooctanesulfonic acid), GenX (trade name), and many others. PFAS have been manufactured and used in a wide variety of industries around the world since the 1940s, including carpet, furniture, water-resistant outdoor gear, firefighting foam and non-stick cookware.

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