Le aree verdi per il miglioramento della qualità ambientale urbana

In the thesis it you may find an introduction about the reasons that prompted my interest in this topic: the improvement of urban environmental quality through green areas. In 2050 the population will reach 9 billion people; consequently, the urban centres will grow in surface and density. Each person will have increasingly expectations among the quality of their life and the desire to live in a "healthy" place. Green areas and their ecological features, their roles and benefits are then described. Main pollutants in urban environment are cited together with the role of plants in reducing their concentrations. The case of the city of Forlì Is taken into consideration, where, through the UFORE method (Urban Forest Effects), the leaf surface used by plants for transpiration, place of deposition, is estimated. Also is estimated the occurrence of absorption of the pollutants. Following this thesis focuses on the importance of the design of green areas; main environments in urban areas and differences in the growth of plants living in natural and man-made environment are described. It is described the importance of ventilation for the reduction of pollutants, and which species are more or less suitable for this goal. It is taken into account another estimation method whose calculations allow to understand the parameters which determine the effects on environmental quality given by vegetation in urban areas. 17 case studies in Belgium are mentioned, in order to understand the wind dynamics based on the geometry of buildings and plants. As conclusion you will find an assessment of all the positives and negatives aspects of the green areas in the cities. You will note that the improvement of environmental quality given by green areas is not granted; it's necessary to carefully choose the proper strategy to achieve the best results.