10.22376/ijpbs.2019.10.1.p1-12 Volume 6 Issue 1 2015 (January - March) In the current research the Air Pollution Tolerance Index (APTI) of Nineteen plant species is found among which four plants are herbs, five are shrubs and remaining are trees. All these plants are growing in highly polluted areas of Hyderabad .The physiological and biochemical parameters ,which are relative to leaf's water content(RWC) ,ascorbic acid content (AA),total leaf chlorophyll(TCH) and leaf extract PH were used to compute the APTI values.On the basis of APTI values, lessThan i greaterThan Acalypha indica , lessThan /i greaterThan lessThan i greaterThan Euphorbia hirta, lessThan /i greaterThan among herbs, lessThan i greaterThan Ricinus communis, Gossypium herbaceum lessThan /i greaterThan among shrubs lessThan i greaterThan , lessThan /i greaterThan lessThan i greaterThan Azadiricta indica, lessThan /i greaterThan lessThan i greaterThan Ficus bengalensis lessThan /i greaterThan showed tolerance lessThan i greaterThan , lessThan /i greaterThan these plants serve as suitable sinks to survive the air pollution and the other plant species lessThan i greaterThan Vinca rosea,Calotropis gigantea, Pithecalobium dulce lessThan /i greaterThan act as bio-indicators of air pollution stress as these are intolerant to the air pollution. INDIRA PRIYA DARSINI. A, S. SHAMSHAD AND M.JOHN PAUL Air Pollution Tolerance Index, Industrial Air Pollution,Hyderabad,Chlorophyll Content , Ascorbic Acid and Relative Humidity 1349-1359