Less traffic pollution in Milan

Annual concentration of nitrogen dioxide (NO2) — a key component of traffic-related air pollution — in the air in the metropolitan city of Milan, in micrograms per cubic meter. The area shaded in pink represents the range of annual average values reported by the 16 NO2 monitoring station in the metropolitan area.

Based on the annual mean concentration of NO2 recorded at 16 urban traffic and background stations in the metropolitan city of Milan.
Source: European Environment Agency Giovanna Coi/POLITICO