Seals in Trouble: The Hidden Danger in Lake Saimaa's Water

Lake Saimaa in Finland is home to a unique group of ringed seals. These seals are facing a silent threat. The water they live in is polluted with harmful chemicals. These chemicals are called perfluorooctanesulfonate (PFOS). PFOS is part of a larger group of chemicals known as PFAS. PFAS are man-mad