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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 measurements for NO2 (二酸化窒素) and SO2 (二酸化硫黄) are taken from the station JP:山形市/山形成沢西 and the measurement for and O3 (オゾン) are taken from the station JP:山形市/山形銅町