dangerous pfas perfluoroalkyl and polyfluoroalkyl substances used in products and materials industry

pfas pfass concept concepts pollutants pollution polyfluoroalkyl pfoa pfos pfna pfhxs perfluorooctanesulfonic perfluorooctanoic contamination organofluorine chemicals attention environmental damage issues illness carcinogen water repellent chemical danger warning synthetic cancer toxic waterproof impermeable waterresistant rainproof compounds fluorinated substances fluorine organic environment health exposure risk dangerous products fluorochemicals carcinogenic biochemistry pollutant microbiology chemistry hazard