Green spaces contribute to removal of significant amounts of air pollutants. This quantitive study, using seasonal monitoring data of Total Suspended Particles (TSP) from green spaces along one street of Pudong Shanghai, demonstrates that vegetation can remove large amount of TSP. Furthermore, correlation analysis have been performed between vegetal status measured by canopy density and shelterbelt porosity and TSP removal percentages. The results show:
(1) Vegetation in green spaces greatly contributes to reduce TSP pollution. The width of green spaces beside the road should not be smaller than 5m, best is 10m and more evergreen trees should be chosen in order to get a noticeable TSP purification effect.
(2) TSP removal percentage is correlated to the canopy density and inverse correlated to shelterbelt porosity. The optimum intervals of canopy density are 0.70-0.85 and shelterbelt porosity are 0.25-0.33.
Proposed the optimum intervals can help to estimate vegetation structure of green spaces and provide technical support for programming and construction of urban green spaces.