The purpose of this legislation is to enhance public health and environmental protection by officially recognizing certain harmful chemicals as hazardous air pollutants. Specifically, it aims to add all perfluoroalkyl and polyfluoroalkyl substances, which are often referred to as PFAS, that contain at least one fully fluorinated carbon atom to the list of hazardous air pollutants under the Clean Air Act. This is part of a broader effort to prevent the release of toxic emissions and contamination.