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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 measurement for and CO (一酸化炭素) are taken from the station Raunheim and the measurement for and NO2 (二酸化窒素) are taken from the station Frankfurt-Höchst