Volume No. 7 Issue No.: 4A Page No.: 1693-1702 April-June 2013




Goyal P.*, Mishra Dhirendra and Anikender Kumar

Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, Hauz Khas, New Delhi (INDIA)


Received on : December 07, 2012




Air pollution comprises of several contaminants existing in the atmosphere, which could be either in gaseous state or in the form of particles. The occurrence of air pollution in a given place has numerous and diverse effects on the human health that inhales it. Delhi is more affected by the same since vehicular air pollution is an inescapable occurrence in this city. The rapid urbanization has resulted in a tremendous increase in the number of motor vehicles with the increase in population and urban mobilization in Delhi. Since, the vehicle fleets have even doubled in Delhi in the last decade and the consequent congestion increases, vehicles are now becoming the main source of air pollution in Delhi. Therefore, there is a large impact on air quality due to increased traffic emissions. The results presented in this paper are based on the vehicle emission inventory for the main criteria pollutants, estimated through International Vehicle Emission (IVE) model, which includes the different driving modes of vehicles and meteorological parameters like temperature, humidity, wind etc. The results show that the total emissions of Carbon MoNOxide (CO), Nitrogen Oxide (NOx) and Particulate Matter (PM) from vehicles in Delhi, India were approximately 509, 194 and 15 tons/days respectively during the year 2008-09. The vehicle’s diurnal emission pattern shows two emission peaks in a day, which correspond to morning and evening peak traffic hours. The emissions of CO and NOx due to Personal Cars (PC) are about 34% and 50% respectively, while 2W (2- Wheeler), the main source of CO emission, contributes about 61%. Similarly, PM emissions from Heavy Commercial Vehicles (HCV) are about 89%. Fuel wise emission analysis reveals that petrol is the main contributor of CO emissions while diesel is the main contributor of NOx and PM emissions. It is also observed that CO, NOx and PM emissions at a busiest traffic intersection namely Income Tax Office (ITO) is approximately 15, 6 and 0.5 tons per day respectively, which are found to be the highest followed by ISBT at Kashmere Gate, Nizammuddin etc. In the present study, the vehicular emissions of air pollutants are evaluated by comparing the modeled emission ratios and the ratios of observed concentration of the criteria pollutants in different years at the ITO traffic intersection in Delhi, India


Keywords : Vehicle’s emission, Air quality, IVE model, Pollutants, Delhi