The Importance of Ventilation in Cities:
More than half of the world population now lives in cities. Urban develop in size, height and density. This results in thermal and air pollution loads. Ventilation can counteract. The urban climate is characterized by an increase in the average air temperature and lower average wind speed in comparison to the surroundings.
Effective ventilation of cities has a positive influence on the dilution and removal of air pollutants and the cooling of the urban area. Both mesoclimatic and microclimatic ventilation systems are effective, depending on the location and design of the city. In urban climate maps, they are identified as air paths or fresh air supply from the surroundings.