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PFAS are a group of man-made chemicals—which include perfluorooctyl sulfonate (PFOS) and perfluorooctanoic acid (PFOA)— used to make stain-resistant, water-resistant, and non-stick products since the 1940s. Manufacturers widely used them in common consumer products as coatings, on food packaging, outdoor clothing, carpets, leather goods, ski and snowboard waxes, and more. The U.S. military, local fire departments, and airports use certain types of firefighting foam that also contain PFAS. These chemicals don’t break down easily in the environment. PFAS also builds up in the bodies of exposed people and animals.