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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) and the Tokyo, Japan Environment Agency (東京都環境局) (kankyo.metro.tokyo.lg.jp)
Note that the measurement for and SO2 (二酸化硫黄) are taken from the station 市川本八幡局市川市 and the measurement for and CO (一酸化炭素) are taken from the station 市川稲荷木(車)市川市