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 Carbon dioxide (CO2) is the major greenhouse gas and global warming propellant which is released from human activities especially vehicular emission. The study examined carbon sequestration potential of roadsides trees in Abeokuta, Ogun State. The major roads selected were AseroObantoko (AO), BreweryItaoshin (BI), lyana MortuaryIdiaba (IMI), Presidential Boulevard Kuto (PBK) and PanshekeOjere (PO). After tree identification, concentrations of CO2, CO, NOx, SO2 and H2S along the roadsides were determined using LandDuo gas analyser. Haga Altimeter, Girth Tape and Range Finder were used to determine diameter at breast height and height of the trees for the estimation of AboveGround Biomass (AGB). Regression model was used to estimate carbon sequestered by the urban trees. Data obtained were subjected to descriptive and inferential statistics. Mango (angifera indica), Gmelina (melina aroreal) and Neem (Aadirachta indica) were identified in all the roads while Cassia (Cassia seamea) were found along BI road, Step tree (Terminalia mentalis) along PBK road, and Masquerade (olyalthia longifolia) along AO, IMI and PO roads. The nongreen spaces zones had (p  0.05) higher CO2 and other gases compared to the green spaces zones. The nongreen spaces zones had (p  0.05) higher CO2 and other gases compared to the green spaces zones. Highest AGB 66.82  106 kg m2 was estimated in Neem (Aadirachta indica) along BI roads while highest carbon sequestration of 14273.00 kg m2 was calculated for Gmelina (melina aroreal) along PO road. Carbon dioxide concentration due to vehicular emission reduced with roadsides trees.
Keywords: Vehicular emission; Greenhouse gases; Carbon stock; Urban trees