Stock Photo - 01 February 2022, North Rhine-Westphalia, Bonn: An air filtration unit is installed in a classroom at the Förderschule Derletalschule. The city has begun installing the first of a total of 165 air filtration units in schools and daycare centers. Photo: Rolf Vennenbernd/dpa. - Bonn/North Rhine-Westphalia/Germany

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