Abstract
Particulate matter (PM), especially the small fractions (e.g., PM with diameter less than 2.5 µm, PM2.5) is a serious health problem throughout the world. Vegetation may be used as a biological filter, with its foliage accumulating PM. Thus, massive artificial plantation has been implemented in cities as one of the helpful measures to alleviate the PM pollution. PM accumulation on leaves of 13 species was examined in test field in Beijing using washing-filtering method. The results showed that leaf PM in different size fractions (PM>10, PM2.5-10, PM0.1-2.5) and total PM differed significantly among the tested species. Buxus megistophylla was the most efficient species for PM accumulation per unit leaf area, while leaves of Salix babylonica accumulated least PM per unit leaf area. Important traits for PM accumulation were leaf properties such as the size of the microstructure, stomatal density, and wax shape and structure. The ranking in terms of PM accumulation can be used to select the suitable species to remove PM pollution in urban areas. KEYWORD: Air pollution alleviation; Leaves; Particulate matter; PM2.5; Urban plants
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