Chemicals called perfluoroalkyl substances (PFASs) have been used for decades to make products more stain-resistant, waterproof or nonstick. They’re used in cookware to keep food from clinging to pots and pans. They’re incorporated into clothing, like rain gear, to help repel stains and water, used in foams used to fight wildfires and used in furniture and carpeting to make them resistant to stains and liquids. PFASs are even used in fast food and other packaging to keep food from sticking. These “forever chemicals” — so called because they persist in our bodies and the environment for years — are everywhere.
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