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The Tokyo Metropolitan Government on Monday revealed it learned in June that the concentration of a toxic substance at the proposed site of a new fish market in Toyosu, Koto Ward, was 115 times higher than in a previous inspection but withheld the information for five months from a panel of soil pollution experts.

The toxic substance, benzopyrene, is a carcinogen found in coal tar and automobile exhaust. It is one of 22 chemicals designated as posing a high health risk by the Air Pollution Control Law, although there are no regulations stating its acceptable level, an Environment Ministry official said.

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