evaluation of pollution intensity in different districts of tehran based on measuring chlorophyll, plumb and cadmium heavy metal contents in trees

plane and mulberry trees play a crucial role in purifying the polluted air in tehran as a majorcity. in this research, 13 main districts of tehran city were chosen as study area. 20 completely healthy planeand mulberry species were selected in similar ecological conditions and age range. the uptake of cd and pbwas determined using spectrophotometry, whereas the chlorophyll content was measured applying icpmethod. the statistical results of chlorophyll data put the mulberry and plane trees of the studied districtinto 9 classes (dunkan statistical test). the statistical results put the studied districts in terms of amount ofpb uptake in 3 classes for plane trees and in 5 classes for mulberry trees. the districts were classified in 5classes for plane trees and in 4 classes for mulberry trees in terms of amount of cd uptake. in general, theuptake content of cd and pb is higher in plane trees in comparison with mulberry ones. in other words, planetrees are more sensitive to the uptake of contaminants than mulberry trees. finally, gis maps were designedshowing the average uptake of contaminates in each district.