[Japanese media: abnormal blood tests of some residents in Tokyo detected high concentrations of "permanent chemicals". According to a number of Japanese media reports, high concentrations of "permanent chemicals" were detected in the blood of residents in the Tama area of Tokyo. Experts say the nearby US military Yokota base may be a source of pollution. It is reported that a citizen group conducted blood tests on 650 residents in the Tama area from November 2022 to March 2023, aged between 19 and 92, around the problem of suspected perfluorinated and polyfluoroalkyl substances in drinking water sources in Tama area. The final results released by the group on the 8th showed that the average blood concentrations of perfluorooctane sulfonic acid and perfluorooctanoic acid in 650 people were 10.8 ng per milliliter of blood and 3.8 ng per milliliter of blood, respectively, and the combined average concentration of these two substances was about 2.4 times the national average in Japan.