<p>A significant increase in global tropospheric ozone (O₃) concentration has imposed an adverse impact on the tree species of all biogeographical zones. A knowledge gap is found relating to the responses of tree species from all the regions, along with a comparative account of the difference between the tree functional types (evergreen and deciduous) under ambient and elevated O₃ levels. Considering the existing information from temperate, sub-tropical, and tropical regions, the effects of both ambient (11.8–59.7 ppb) and elevated O₃ (40–150 ppb) were assessed for growth and physiological parameters. Photosynthesis and growth (in terms of total biomass) were extensively assessed in the studies. An overall decline in photosynthesis was observed in the trees of the subtropical region from 17 to 54%, while the decline was more pronounced in temperate trees, ranging from 13 to 69%. The mean reduction in total biomass was remarkably higher in temperate trees (13 to 62%) than in subtropical trees (5 to 52%) at 60–150 ppb of O₃. It is inferred that the deciduous trees from temperate regions were found to be more sensitive to O₃ than evergreen trees from subtropics. The limited exploration of the tropical region has made the screening and comparative gradation of trees difficult. The present review, comprising diverse studies, will provide an ideal framework to expand our understanding of O₃ impacts across plant functional types, especially for evergreen and deciduous species.</p>