空气质量预报
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空气质量数据提供者: 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)
Note that the measurements for NO2 (nitrogen dioxide), SO2 (sulfur dioxide) and O3 (ozone) are taken from the station: Sumiyoshicho, Sakata, Yamagata