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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 (озон) are taken from the station Braunschweig and the measurement for and SO2 (сернистый газ) are taken from the station Salzgitter-drütte