In general cities have construction materials that are slow to cool and heat which store a large amount of energy and are almost always dark heat collectors. In addition the city's surface is often impermeable which reduces the amount of water available for evaporation (greater dryness in the city). As the city grows so does its island of heat.
Air quality suffers and smog may appear . Global warming can further increase the heat island effect endangering the health of citizens : thermal stress Australia WhatsApp Number List heat stroke dryness respiratory and heart conditions allergies diseases pests This affects economic activity and costs energy and environmental.
The heat island increases the energy for cooling which in turn feeds the heat island. It is a vicious circle in which the city becomes a stifling and unpleasant place. Green zones and blue zones The structure of the city (height of the buildings width of the streets) affects the characteristics of the heat island and altering it could mitigate it.