31.05.2022, Hannover, Niedersachsen, Deutschland - Corona-Ampel (Infektionsschutzampel) mit angeschlossenem Luftmessgeraet der Firma airocom fuer Schulen fuer intelligentes Lueften. 00A220531D135CARO.JPG (KEYSTONE/CARO/Caro / Bastian)
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