STUDY ON AIR POLLUTION TOLERANCE LEVEL OF SELECTED TREE SPECIES IN THE HOLY TOWN OF KANCHIPURAMR. SUMATHI AND 1G. SRIRAMAbstract Pollution due to Air is one of the severe problems faced by the community all over the country. Kanchipuram, one of the holiest cities is highly polluted nowadays due to rapid urbanization and indutrilisation. One of the mitigation measures taken for air pollution is planting of trees along the roadsides and in industries. Plants are acting as sink for the air pollutants and useful in control of air pollution. This study aims to find out the persistence level of plants species against the pollution. For this five plant species leaves in two different heights were selected at various sites and analysis were carried out to find their Air Pollution Tolerance Index. Correlation was made between their biological parameters. From the results obtained, the plant species were arranged based on their difference in tolerance by comparing control site with heavy traffic area and low traffic area as Thespesia populena (1.42%) >Pongamia glabra (2.77%) > Saraca asoca (5%) > Syzygium cumini (6.24%) >Terminalia catappa (14.67%) and Thespesia populena (1%) >Saraca asoca (1.7%) > Syzygium cumini (1.79%) >Terminalia catappa (2.87%) >Pongamia glabra (4.2%) respectively. The species which are showing low percentage reduction can be used as sink for the pollutants and high percentage reduction can be used as bio indicator. This study concludes that Air Pollution Tolerance Index values for the plant species are varying according to the response shown by them against the pollutants irrespective of the site selected.
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