Urban greenery with the help of trees is the best and only method for lowering air pollution because the leaves of the trees absorb particulate matter, gases (such as sulphur oxides and nitrogen oxides), and metals. The ascorbic acid concentration, total chlorophyll content, leaf extract pH, and relative water content of 10 commonly found urban trees were assessed in the current study to determine their Air Pollution Tolerance Index (APTI) values. The study was taken up in three different urban localities, viz., control zone, heavy traffic zone and industrial zone in Coimbatore urban area of Western Tamil Nadu, India during the year 2021 – 22 under three different seasons namely summer, winter and rainy seasons. It was revealed that Thespesia populnea, Polyalthia longifolia and Delonix regia were outstanding tree species with high APTI value, which will perform best in urban air pollution condition. The remaining 7 tree species were categorized into good tolerant and moderate tolerant tree species, which can be used as 2nd and 3rd tier tree retardant rather than separate plantation programme in urban cities. This highly tolerant tree species in urban localities will not only helps in reducing the air pollution level, but also acts as a barrier as environmental protector.