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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 (озон) are taken from the station Marburg and the measurement for and CO (окись углерода) are taken from the station Gießen-Westanlage