Evaluation of air pollution tolerance index of tree species of Bikaner city (Rajasthan)

The air pollution tolerance index (APTI) is one of the modern tools for assessing impacts pollutants on plant physiology. value APTI different species. Plants with higher values are tolerant and act as a sink due to their bioaccumulation ability pollutants. Hence, they can be planted establish green belts in areas severe pollution, especially industrial zones. present investigation was carried out assess top twenty urban tree species Bikaner city North-Western Rajasthan. leaf samples were taken from selected roadside trees distributed residential, commercial zones city. On basis values, it observed that Leucaena leucocephala (23.41), Eucalyptus camaldulensis (21.87) Cassia siamea (21.39) had an above 20 therefore classified Similarly, Pongamia pinnata (9.48) showed under 10, falls into sensitive category. 80 % total studied area categorized moderately There no very (APTI < 1) > 30)