Polluted air in the Tokyo metropolitan area poses the most danger to human health, followed by Osaka and Kanagawa, according to a newly compiled environmental health-risk study.
The study, conducted by a research group at Yokohama National University, shows that Shizuoka has the worst score among Japan's 47 prefectures in terms of health risks linked to water pollution, followed by Ehime and Okayama.
The research team, led by Kohei Urano, a professor at Yokohama National University, compiled the results on the basis of pollution data published by the government.