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Military and international airport PFAS contributions. Map of Raleigh–Durham International Airport and the North Carolina National Guard facility with averaged ToxPi profiles of all detected PFSA, PFCA, and PFASA compounds in the pine needles from four sites in 2019–2020. The chemical structure of PFECHS, a cyclic PFSA which was only detected at these four sites, is displayed. The PFECHS slice is indicated on each ToxPi with a white hash mark.
