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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 (carbon monoxide) are taken from the station Frankfurt-Schwanheim and the measurements for NO2 (nitrogen dioxide) and SO2 (sulfur dioxide) are taken from the station Frankfurt-Höchst