Most people believe that cities are the world's largest source of carbon dioxide emissions. Meanwhile, UGSs offer important ecosystem services and function as carbon sinks by absorbing carbon into their biomass. This study aims to evaluate the urban tree canopy and determineWith the increasing levels of carbon dioxide emissions in cities, it is vital to evaluate the potential for above-ground carbon storage in urban green spaces (UGS) so that these areas can mitigate these emissions. Both both private and public land in Lahore city were analysed to identify nine main land cover classifications. The structure, biomass, and carbon reserves of urban green spaces were determined using stratified random sampling of the regions. In order to determine the potential carbon storage capacity of UGS, 200 plots were sampled. For tree vegetation, we employed allometric equations, and for understory vegetation, we used destructive sampling to determine the plant biomass carbon reservoir. At UGS, we discovered 42 distinct species of trees. The average stem density in urban trees was found to be 441 ha−1, the average basal area to be 31.46 m2 ha−1, and the average diameter to be 26.91 cm. When looking at stem density, base area, and relative frequency, Alstonia scholaris, Polyalthia longifolia, Acacia citriodora, Fibre religiosa, Azadirachta indica, and Cassia fistula received the highest Importance Value Index compared to other tree species. The vegetation above ground in Lahore's urban areas stores 5574.20 Gg of carbon. In general, trees retain an average of 94.46 (±0.63) MgC/ha, but shrubs and herbs store an average of 3.46 ±0.01 or 1.44±0.08 MgC/ha, respectively. Public green spaces and green belts, which are heavily forested and subject to little human interference, The study found that trees retain a higher amount of carbon than other kinds of green areas. Near homes, businesses, and industrial zones, as well as other development regions, green spaces often have lower carbon stocks. Carbon emissions have increased due to the expansion of Lahore's numerous industries. As a result of development, green spaces in urban areas management is receiving less attention. National while regional carbon budgets should incorporate UGS, and urban development should take them into consideration. Urban global warming policy can benefit from these results, which supplement global carbon budget databases.

Key words: Urban green spaces, carbon sequestration, urban tree structure, urban planning