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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 measurement for and NO2 (nitrogen dioxide) are taken from the station Ochiaichō Chikanori, Takahashi-shi, Okayama-ken and the measurements for SO2 (sulfur dioxide) and CO (carbon monoxide) are taken from the station Chuo, Soja, Okayama