空气质量数据提供者: the Czech Hydrometeorological Institute (Český hydrometeorologický ústav) (portal.chmi.cz)
Note that the measurements for PM2.5 (fine particulate matter), PM10 (respirable particulate matter), NO2 (nitrogen dioxide) and SO2 (sulfur dioxide) are taken from the station: Plzen-stred, Plzensky