Per- and polyfluoroalkyl substances, better known as PFASs, are a group of man-made chemicals that include PFOA (perflourooctanoic acid), PFOS (perflourous sulfonic acid) with many other variations. These were made for various industries around the world including in the United States since the 1940s. The most extensively produced types have been studied more than others but both these chemicals persist to environmental conditions and can accumulate over time - meaning they break down very slowly or not at all within living organisms making them an unsustainable resource which could also lead to adverse human health effects like cancers observed by epidemiologists from different parts of America after decades ago when firefighting foam containing this type was used by the military to extinguish fires.
PFAS are a group of chemicals with industrial, commercial and home uses. They’ve been around since the 1930s and started being produced in quantity in the 1950s. Since then they’ve gotten into every corner of our lives, and many processes produce large quantities of PFAS-contaminated waste.