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Air Quality Data provided by the Luftqualität | Nds. Ministerium für Umwelt, Energie und Klimaschutz (umwelt.niedersachsen.de)
Note that the measurement for and O3 (ozono) are taken from the station Braunschweig and the measurement for and SO2 (dióxido de azufre) are taken from the station Salzgitter-drütte