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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 SO2 (二酸化硫黄) are taken from the station 土浦保健所土浦市 and the measurement for and CO (一酸化炭素) are taken from the station 土浦中村南土浦市