PFAS, or Perfluoroalkyl and Polyfluoroalkyl Substances, do not break down in the environment, raising concerns about the consequences of them building up in ecosystems, drinking water and the human body PFAS, or Perfluoroalkyl and Polyfluoroalkyl Substances, do not break down in the environment, raising concerns about the consequences of them building up in ecosystems, drinking water and the human body Health Health News, Wellbeing Tips, Diseases, Treatment and Nutrition | The Hindu