| Abstract | The aim of this study is to produce the air pollution emission inventory for the Phnom Penh city (PHN) which is applicable, in particular, for dispersion modeling purpose. Five pollutants were selected, namely, SOx, NOx, CO, SPM and VOC. Results show that annual emission for these pollutants are 1,440 tons, 8,910 tons, 41,380 tons, 5,080 tons and 9,760 tons, respectively. Point source has the highest contribution to total emission of SOx (64%) while the mobile source contributes largely to CO (88%), NOx (85%) and VOC (65%). For SPM, however, the unpaved road is the highest contributor (35%). A simple 2D dispersion model, MUAIR, was applied to estimate the CO concentration in the city. The simulation result shows that the first and second highest hourly CO concentration in PHN reached 44 mg/m3 (exceed the standard of 40 mg/m3) and 22 mg/m3, respectively. Various scenarios for traffic emission reduction have been studied including BAU, BD, CNG bus & minibus and MTS. The result from BAU indicated that maximum and second highest hourly CO will increase from 31 and 16 mg/m3 in 2005 to 83 and 41 mg/m3 in 2020, respectively. Both BD and CNG options do not bring in significant emission reduction of CO hence the CO concentration would only slightly decrease. MTS, however, would result in a significant reduction of CO concentration during the period. Further improvement of El is still required to produce more accurate modeling results. |