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) and 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.taiki.go.jp)