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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 Hokkaido Prefecture EPA (北海道) (pref.hokkaido.lg.jp)
Note that the measurements for PM10 (particulalas respirable), NO2 (dióxido de nitrógeno) and SO2 (dióxido de azufre) are taken from the station JP:函館市/中部小学校 and the measurement for and O3 (ozono) are taken from the station Mihara, Hakodate, Hokkaido Prefecture