Urban forests have many functions. Besides providing recreational space and contributing to a reduction in heat stress, they can create islands of relatively clean air in a city. When creating urban forests and parks, a level of optimalisation must be reached whereby the proximity is close enough to enable air purification while retaining sufficient open space for urban ventilation and the alleviation of heat stress.
Mixed forests with open areas with places for sunbathing and playing meet all demands. Urban forests produce much biomass, which can be used for urban energy production. Urban forests contribute to the reduction of a city’s air temperature.