Abstract: The disclosure relates to a plant, especially power plant, for reduction of the carbon dioxide content in atmospheric air, especially for improvement of atmospheric air quality. The plant has at least one electrolysis unit for oxygen production, at least one carbonization unit for carbon synthesis, especially a Bosch reaction unit, and at least one unit for cleaning of ambient air from an outside atmosphere surrounding the plant. The carbonization unit synthesizes carbon from carbon dioxide which is obtained from the atmosphere by means of the carbon dioxide sorption unit and this carbon is stored, in order to effectively reduce the proportion of carbon dioxide in the atmosphere. The disclosure further relates to a method of operating such a plant, with which the carbon dioxide content in the atmosphere can be efficiently reduced.