Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4443101 | Atmospheric Environment | 2007 | 13 Pages |
Abstract
Hourly concentrations of benzene, toluene, ethylbenzene, m,p-xylenes, and o-xylene (BTEX) plus CO, NOx, SO2 were monitored at roadsides simultaneously with the traffic volume during the dry season of 2004, in Hanoi, Vietnam. The selected three streets included Truong Chinh (TC) with high traffic volume, Dien Bien Phu (DBP) with low traffic volume, and Nguyen Trai (NT) with high traffic volume running through an industrial estate. BTEX were sampled by SKC charcoal tubes and analyzed by GC-FID. Geometric means of hourly benzene, toluene, ethylbenzene, m,p-xylenes and o-xylene are, respectively, 65, 62, 15, 43, and 22 μg mâ3 in TC street; 30, 38, 9, 26, and 13 μg mâ3 in DBP street; and 123, 87, 24, 56, and 30 μg mâ3 in NT street. Levels of other gaseous pollutants including CO, NOx, and SO2, measured by automatic instruments, were low and not exceeding the Vietnam national ambient air quality standards. BTEX levels were comparatively analyzed for different downwind distances (3-50 m) from the street, between peak hours and off-peak hours, as well as between weekdays and weekend. Results of principal component analysis suggest that the gaseous pollutants are associated with different vehicle types.
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Physical Sciences and Engineering
Earth and Planetary Sciences
Atmospheric Science
Authors
Vo Thi Quynh Truc, Nguyen Thi Kim Oanh,