Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 25, Issue 2, Pages 348-356Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(12)60045-X
Keywords
air pollution; benzene; BTEX; HoChiMinh; motorcycle exhaust
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Funding
- Vietnam National University
- HoChiMinh City
- Vietnam National Foundation for Development of Science and Technology
- Core-University JSPS Program
- Japan Society for Environmental Chemistry
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Monitoring of benzene, toluene and xylenes (BTEX) was conducted along with traffic counts at 17 roadside sites in urban areas of HoChiMinh. Toluene was the most abundant substance, followed by p,m-xylenes, benzene, o-xylene and ethylbenzene. The maximum observed hour-average benzene concentration was 254 mu g/m(3). Motorcycles contributed to 91% of the traffic fleet. High correlations among BTEX species, between BTEX concentrations and the volume of on-road motorcycles, and between inter-species ratios in air and in gasoline indicate the motorcycle-exhaust origin of BTEX species. Daily concentrations of benzene, toluene, ethylbenzene, p,m-xylenes and o-xylene were 56, 121, 21, 64 and 23 mu g/m(3), respectively. p,m-xylenes possess the highest ozone formation potential among the BTEX family.
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