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Potentially harmful chemicals found in blood of Tokyo citizens: civic group

XINHUA logo XINHUA 03/02/2023 Tu Yifan
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Pedestrians walk on the street in Tokyo, Japan, Nov. 15, 2022. (Photo by Sun Jialin/Xinhua)

Potentially harmful substances have been detected in the blood samples of some residents of Tokyo, Japan, and the source of the contamination may be related to U.S. military bases, said a civic group.

TOKYO, Feb. 3 (Xinhua) -- A Tokyo citizens group said it has detected high concentrations of potentially harmful substances known as PFAS in the blood samples of some inhabitants of the western area of the Japanese capital, local media reported, suggesting contamination of local water supply perhaps attributable to U.S. military base activity.

The civic group told reporters on Monday that PFAS, or perfluoroalkyl and polyfluoroalkyl substances, are found in firefighting foam used on U.S. military bases, but it was unclear whether the contamination had any relation to the Yokota Air Base, a U.S. Air Force installation located in the Tama area of western Tokyo, Kyodo News reported.

Koji Harada, associate professor of public health at Kyoto University who headed the testing efforts, said, however, the concentrations of PFAS found should not cause serious damage to health, said the report.

PFAS is a general term for a group of artificial chemicals, such as PFOS, or perfluorooctane sulfonate, and PFOA, or perfluorooctanoate.

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People shout slogans against the decision from the top court outside Japan's top court building in Tokyo, Japan, Dec. 20, 2016. (Xinhua/Ma Ping)

The group began carrying out tests in November to determine the source of the contamination, which involved 87 people, mostly residents of Kokubunji and some from other cities, such as Kodaira, Koganei and Musashino, according to Kyodo News.

The interim results showed that 21 of them were found to have exceeded acceptable levels of PFOS in their bloodstream while six of the 21 had unacceptable levels of PFOA.

Harada said that the concentration is evidently high for some residents, which leads one to think potable water is the main cause of it.

The state and local governments must deal with the issue from the perspective of what to do with the source of contamination, Harada added. 

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