PFAS chemicals appear in an array of everyday items, such as food packaging, clothing and carpeting. While total PFAS concentrations were generally less than 1 nanogram per liter (ng/l), the highest total concentration was nearly 5.5 ng/l in a single sample from Massachusetts. Several samples contained total PFAS levels at or about 4 ng/l. Shafer says he suspects PFAS chemicals are entering rainwater through a variety of avenues, like direct industrial emissions and evaporation from PFAS-laden fire-fighting foams. Still, “there’s a dearth of knowledge about what’s supporting the atmospheric concentrations and ultimately deposition of PFAS”, he says.

Source: The Guardian December 17, 2019 09:00 UTC