The organisers and the city government had discovered the material two years ago and then deemed the amount not to be large, in a stable condition and  not accessible to the public and thus not considered harmful. However, the Tokyo government has since reviewed the assessment and decided to implement asbestos containment measures.

Asbestos, a material used for fireproofing and insulation, has been known to cause several health problems, most notably cancer. Japanese construction industry regulations state that asbestos should be removed or covered up.

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