The U.S. Environmental Protection Agency (EPA) has created a new “working definition” of per- and polyfluoroalkyl substances, also known as PFAS. The updated definition is narrower, leaving out many chemicals in pharmaceuticals, pesticides and even some refrigerants.  Scientists are concerned that the agency’s redefining of PFAS makes these chemicals seem less toxic, and critics have … Continue reading New PFAS Definition by EPA Omits Pharmaceutical, Pesticide Chemicals