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Air Quality Data provided by the Hessian State Office for Nature Conservation, Environment and Geology - (Hessisches Landesamt für Naturschutz, Umwelt und Geologie) (hlnug.de)
Note that the measurements for PM2.5 (小颗粒物) and NO2 (二氧化氮) are taken from the station Friedberger Landstr., Frankfurt and the measurement for and CO (一氧化碳) are taken from the station Offenbach-Untere Grenzstraße and the measurement for and SO2 (二氧化硫) are taken from the station Hanau