Air pollution is a major problem that affects cities’ livability, resilience and long-term viability. It has a direct impact on health and comfort, as well as an increased risk of morbidity and mortality. Vehicular traffic is a major source of carbon emissions, which contributes significantly to air pollution. Changes in morphological factors will help to mitigate the negative consequences of poor air quality. As a result, thorough research into the effects of various morphologies on urban ventilation and carbon concentration due to vehicles is critical. In recent decades, computational fluid dynamics models have been frequently employed to examine the impact of urban morphology on urban ventilation. However, most of the studies are concentrated on idealistic building layouts, with little extensive exploration into the effect of actual urban morphologies. In this study, Local Climate Zone (LCZ)—an effective land classification system for urban studies was analyzed for its impact on vehicular carbon concentration and subsequent microclimatic effects. Three LCZs, namely LCZ-2, LCZ-5 and LCZ-9A representing high density, medium density and low density respectively, were analyzed for its microclimate, traffic flow and carbon concentration using calibrated instruments. It is observed that among the three selected LCZs, LCZ 9A has the least CO2 content and LCZ-2 has the maximum. The study throws light into the impact of urban built morphology on vehicular carbon concentration. This type of research can be helpful for practitioners and urban designers, especially during the early stages of planning, to identify places that may be prone to poor air quality owing to motor traffic without having to undertake expensive simulations.