Abstract
Effect of urban air pollution on roadside tree species Pongamia pinnata(L.) Merr. has been studied with special reference to epidermal characteristics of leaves. The light microscopic studies of this plant indicated marked alteration in epidermal traits, with increased number of stomata and epidermal cells per unit area in leaf samples collected from polluted sites than those from control site. Results revealed that, as compared to the leaves from control, the length and width of guard and epidermal cells reduced considerably in leaves of polluted sites. These changes in epidermal traits could be as indicator of environmental stress and can be recommended in high traffic density area for the early detection of urban air pollution.
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