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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 Ozaka, Japan Environment Agency (大阪府 大気汚染監視) (taiki.kankyo.pref.osaka.jp)
Note that the measurements for NO2 (nitrogen dioxide), SO2 (sulfur dioxide), CO (carbon monoxide) and O3 (ozone) are taken from the station Kohama, Osaka Prefecture