Relative change in number of metropolitan subway users in Tokyo Japan 2020, by time
Due to the growing number of the coronavirus (COVID-19) infections in Japan, the government officially declared a month-long state of emergency on April 7 for seven prefectures including Tokyo, and insisted citizens to stay home and work from home at least until May 6, which was later expanded to all of Japan with the duration of until the end of May. On May 25 however, the government lifted the state of emergency for all 47 prefectures in Japan.
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