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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.

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