Effect of speed on emissions of air pollutants in urban environment: case study of truck emissionsOutapa, P., Kondo, A. and Thepanondh, S.
International Journal of GEOMATE, 11(23): 2200-2207
Dynamic emission factors and emission inventories of CO, VOC, VOCevap., NOx, SOx and PM of truck in Bangkok, Thailand were developed using IVE (International vehicle emission) model for the year 2012 to 2024. The year 2012 was chosen as base year since fuel quality had been improved from Euro II to Euro IV standard from that year. Speed of truck driven in study area was chosen as variable parameter for sensitivity analysis of its influence to the emissions of air pollutants because there are no further plants in upgrading or improvement of fuel quality during this period. Truck’s Bangkok driving cycle was used as input data in the IVE model. Average speed used in the model simulation were varied from existing condition (15 km/hr) to the maximum of 80 km/hr. It was found that an average speed of 40 km/hr was the optimal speed in reducing of air pollutants emitted from trucks. At this speed, reduction of emission factors of air pollutants as compared with current average velocity of 15 km/hr were about 46%, 54%, 16%, 51%, 53% and 27% for CO, VOC, VOCevap., NOx, SOx and PM, respectively. Therefore, efforts in increasing average speed of at least to about 40 km/hr can be used as a measure to achieve the sustainable transport particularly in the green logistic businesses.