ESTIMATION OF AIR POLLUTANTS EMISSION FACTORS FOR VEHICLES ON ROAD TRAFFIC SUITABLE WITH HOCHIMINH CITY CONDITION

The estimation of emissions depends strongly on t he quality of the emission factors used for the calculations. It is necessary to find method for estimation of emission factors from road traffic to calculate the emissions of air pollutant s from transportation activity in Hochiminh City (HCMC). From the research results, suitable method and trac er were selected. Emission factors of 15 VOCs from C2-C6, NOx, and CO from road traffic in HCMC were estimated . The measurement campaign was carried out in 3/2 street., distrist 1 0, HCMC from 10h00 to 22h00 per day. Three VOCs compounds with high average emission fac tors were hexane (59,7 ± 9,2 mg/km.veh.), i-pentane (52,7 ± 7,4 mg/km.veh.) and 3-methylpentane (36,1 ± 3,6 mg/km.veh.). The average emission factor of NO x and CO were 0,20 ± 0,03 g/km.veh and 23,37 ± 6,61 g/km.veh, respectively. Besides, the emission factors of air pollutants for motorcycles, light duty vehicles and heavy duty vehicles were caculated by regression li near method.