pfas contamination in the ground - perfluoroalkyl and polyfluoroalkyl substances

land grounds soil pfas pfass concept concepts pollutants pollution pfoa pfos pfna pfhxs pesticides grounf field rural scene cultivation fertilization fertilizer chemical agriculture ploughed polyfluoroalkyl forever fertilizing agricultural contamination chemicals environmental damage issues illness carcinogen water repellent danger warning cancer toxic waterproof impermeable waterresistant compounds fluorinated substances organic health risk carcinogenic pollutant chemistry