Abstract
The application of Chemical Element Balance (CEB) air pollution model to ambient measurements of 15 non-methane volatile hydrocarbons (NMHC) is presented. Ninety six of a half hour samples were collected at three recepter locations (general air monitoring stations) in Osaka City in the early morning (6 : 30-8 : 30) during 1987-1988 and analyzed for the concentration of NMHC. The average ambient samples at each recepter location (n=16, in summer and winter, respectively) were evaluated for six sources of NMHC [three types of vehicles ; light duty gasoline car (LDG), super light duty gasoline car (SLD), LPG fueled car (LPG), gasoline vapor, solvent and petroleum refinery]. The average source contributions (n=48) at three receptor locations in summer and winter were as follows. Vehicles (LDG+SLD+LPG) ; 39.12% in summer and 45.64% in winter. Solvents ; 19.86% (summer) and 20.40% (winter), gasoline vapor ; 5.02% (summer) and 4.55% (winter), petroleum refinery; 13.53% (summer) and 13.61% (winter) and other (unexplained sources); 22.7% (summer) and 15.80% (winter). Vehicles were the largest source of the measured NMHC. In Japan, it has been too difficult to determine a vehicle source profile in CEB model, then a road-side data has been used. The results of this study may suggest that three vehicle source profiles are necessary in the adaptation of CEB model to urban atmospheric NMHC of Japan.
