The rapidly increasing number of vehicles on the roads have posed the problem of excessive emissions which is one of the major contributors towards air pollution is not limited to metropolitan cities and increasing rapidly in smaller cities of India. The policy makers have been trying hard to control air pollution by implementing fuel quality and stringent emission norms, promoting electrical vehicles and new policy measures, such as ODD-EVEN schemes to limit the use of privately owned vehicles. The present work analyses driving cycles and driving characteristics of the vehicles heavy duty CNG buses to study the change in the vehicular emissions and its contribution towards the pollution in the city’s air during the famous odd-even policy was applied twice in Delhi for two weeks in winter and Summer season. The speeds and positions of the buses were collected by speed sensors and GPS data logging and a database of speed distributions was prepared. A computer program was developed in MATLABTM to calculate various driving characteristics out from the different speed distributions of transport buses over twenty different routes. Moreover, the parameters responsible for the emissions are calculated and compared for the vehicles running before and after the application of rule. The International Vehicle Emission Model ( IVE) was used to simulate emissions by selecting the suitable vehicle category and driving pattern as an input parameter. This paper analyses the change in the magnitude of driving characteristics and their subsequent effects on the emissions after the enforcement of odd-even rule. The new driving cycles were developed for heavy duty CNG buses and compared with standard driving cycles, such as, European Transient Cycle (ETC) and World Harmonized Transient Cycle (WHTC) and to estimate the deviation in real world driving emissions and laboratory measurements. The study revealed that there was no significant change in driving parameters and consequently emissions between regular days and ODD-EVEN scheme days. However, real world driving emissions were observed significantly higher as compared to emissions on standard driving cycles.The CO2 emission values for real world driving was simulated about 600 g/km with respect to FIGE cycle (350 g/km) and WHVC cycle (450 g/km). However, for most of the emissions WHVC cycle better represented real world driving emissions of India as compared to ETC cycle.