Ottelé et al., 2009). Leaves of some species possess specific morphological features that may enhance air filtration process by capturing more particles, such as, trichomes and structure of epicuticular wax layer (Bakker et al., 1999). Species with trichomes, wide and rough leaf surfaces and thicker epicuticular wax layer are considered more effective accumulators of PM (Li et al., 2015). The epicuticular wax layer, its thickness and composition are important factors for PM accumulation, because some particles penetrate inside it and are deposited there (Kaupp et al., 2000). Particulate matters are captured by twigs and bark and remain there for long time period because of their surface characteristics. Mainly, leaves act as constant absorbers for particulate matters as they are more exposed part of the plant (Samal and Santra, 2002). Trees capture more particulate matter as compared to shrubs and herbs. The structure of tree crowns leads to turbulent air movements, which increase PM deposition on leaves (Fowler et al., 1989). Trees, with their large total leaf area, are considered the most effective type of vegetation for this purpose (McDonald et al.,…