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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 O3 (臭氧) and NO2 (二氧化氮) are taken from the station Frankfurt-Ost and the measurement for and CO (一氧化碳) are taken from the station Frankfurt-Schwanheim and the measurement for and SO2 (二氧化硫) are taken from the station Hanau