Stock Photo - 15 April 2019, Baden-Wuerttemberg, Stuttgart: Workers are installing a high-tech road surface at Stuttgart's Neckartor. The Stuttgart civil engineering office is renewing parts of the carriageways with a photocatalytic road surface, which is intended to reduce the air pollution caused by nitrogen oxides. Photo: Fabian Sommer/dpa. - Stuttgart/Baden-Wuerttemberg/Germany

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