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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 (диоксида азота) are taken from the station Ochiaichō Chikanori, Takahashi-shi, Okayama-ken and the measurements for SO2 (сернистый газ) and CO (окись углерода) are taken from the station Chuo, Soja, Okayama