They have noted that the levels of some harmful PFAS in the atmosphere are not declining notably despite their phase out by the major manufacturer, 3M, already two decades ago. The Stockholm University team have conducted laboratory and field work on the atmospheric presence and transport of PFAS for the past decade. Although in the industrial world we don’t often drink rainwater, many people around the world expect it to be safe to drink and it supplies many of our drinking water sources,” Cousins continued. guidelines for PFOA in drinking water, rainwater everywhere would be judged unsafe to drink. For example, the drinking water guideline value for one well known substance in the PFAS class, namely the cancer-causing perfluorooctanoic acid (PFOA), has declined by 37.5 million times in the U.S.” said Ian Cousins, the lead author of the study and professor at the Department of Environmental Science, Stockholm University. “There has been an astounding decline in guideline values for PFAS in drinking water in the last 20 years. A perspective article by researchers from Stockholm University and ETH Zurich published in Environmental Science & Technology suggests that PFAS define a new planetary boundary for novel entities that has been exceeded. As a result, the levels in environmental media are now ubiquitously above guideline levels. During the last 20 years, guideline values for PFAS in drinking water, surface waters and soils have decreased dramatically due to new insights into their toxicity. Per- and polyfluoroalkyl substances (PFAS) are man-made hazardous chemicals that are spread globally in the atmosphere and as a result they can be found in the rainwater and snow in even the most remote locations on Earth.
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