Air pollution in the urban area: Concentrations rise and assimilate in different ways in each area of the city
Air pollution in an urban area comes from a variety of different sources. Vehicles, factories, Power plants and others contribute to the accumulation of pollutants in the urban air. Fresh air systems in buildings are in charge of bringing in fresh air from the outside into the building. Along with the air, the system also brings on the urban air pollutants.