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Air Quality Data provided by the Japan Atmospheric Environmental Regional Observation System (環境省大気汚染物質広域監視システム) (soramame.env.go.jp)
Note that the measurement for and SO2 (sulfur dioxide) are taken from the station Ashiyamachō, Sakado-shi, Saitama-ken and the measurement for and CO (carbon monoxide) are taken from the station Nakakayama, Hidaka, Saitama and the measurement for and O3 (ozone) are taken from the station Iseharachō, Kawagoe-shi, Saitama-ken