Stock Photo - 31 January 2019, Berlin: Measuring instruments for determining air quality can be seen on the roof of an air measuring station on a street in the Berlin district of Steglitz. The limit values of the European Union are 40 micrograms per cubic meter with an annual average value of the sum of the nitrogen oxides. Photo: Gregor Fischer/dpa. - Berlin/Berlin/Germany

Stock Photo: 31 January 2019, Berlin: Measuring instruments for determining air quality can be seen on the roof of an air measuring station on a street in the Berlin.

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