(August 10, 2022, 1:32 PM EDT) -- NORRISTOWN, Pa. — A Pennsylvania municipality sued the 3M Co., DuPont de Nemours & Co. and other makers of per- and polyfluoroalkyl substances (PFAS) in state court on July 29, contending that they knew about, yet concealed, the dangers of PFAS in the firefighting agent known as aqueous film forming foam (AFFF), which has contaminated local groundwater....