PFAS concentrations in blood samples from 87.4 pct of those tested in a town in Okayama Prefecture, western Japan, exceeded a U.S. standard for the potentially carcinogenic chemicals, it was learned Tuesday. A total of 709 people, aged 2 to 102, took blood tests between November and December last year in the town of roughly 10,000 inhabitants. The highest recorded level of PFOA stood at 718.8 nanograms per milliliter of blood, while the average amounts of the seven PFAS substances totaled 151.5 nanograms, both significantly higher than the U.S. health standard.