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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 O3 (オゾン) are taken from the station Frankfurt-Ost and the measurement for and SO2 (二酸化硫黄) are taken from the station Frankfurt-Schwanheim