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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 Ibaraki Prefecture EPA (茨城県大気汚染常時監視システム) (taiki.pref.ibaraki.jp)
Note that the measurement for and CO (carbon monoxide) are taken from the station Ōtsugaoka, Kashiwa-shi, Chiba-ken