Abstract
The biomass of Alstonia scholaris, Pongamia pinnata, Cassia siamea and Peltophorum pterocarpum in the term of leaf dry weight
was significantly (p<0.05) affected in Karachi city. Plants were more affected to pollutants at Gulshan-e-Iqbal, Nazimabad, Shahrahe-Faisal and M.A. Jinnah road as compared to Karachi University Campus. In periodical studies, the leaves dry weight of all tested
species were found lowest at M.A. Jinnah road as compared to Shahrah-e-Faisal, Nazimabad, Gulshan-e-Iqbal and Karachi University
Campus, respectively. Leaf dry weight of A. scholaris, P.pinnata and C. siamea were significantly (p<0.05) reduced in SeptemberNovember at the highly polluted sites of M.A. Jinnah road as compared to Karachi University Campus. Whereas, leaf dry weight of
P. pterocarpum was found significantly (p<0.05) reduced at M.A. Jinnah road in June-July as compared to other less polluted sites of
the city. In this study, P. pterocarpum was found less affected to automobile pollution of the city as compared to other species.
