EIA 2006 |
Society for Environmental Information Sciences
Environmental Informatics Archives
ISSN 1811-0231 /
ISEIS Publication Series Number P002
2006 ISEIS. All
Paper EIA06-027, Volume 4
(2006), Pages 304-311
Trends of Petrol Vehicle Fleet Emissions in Hangzhou, China by Remote Sensing
H. Guo, Q. Y. Zhang*, W. G. Xu, Y. Shi and D. H. Wang
Department of Environmental Engineering, Zhejiang University, Hangzhou, China. *Corresponding author: qy_zhang @zju.edu.cn.
Motor vehicles are one of the largest sources of air pollutants worldwide. Despite their importance, motor vehicle emissions are inadequately understood and quantified, esp. in developing countries. In the present study, the real-world emissions of vehicles were measured using a remote sensing system at five sites in Hangzhou, China from February 2004 to August 2005. More than 48,000 valid gasoline powered vehicle emissions of carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxide (NO) were measured. The results show that petrol vehicle fleet in Hangzhou has considerably high CO emissions, with the average emission concentration of 2.71±0.02 %, while HC and NO emissions are relatively lower, with the average emission concentration of 153.72±1.16 and 233.53±1.80 ppm, respectively. Quintile analysis of both average emission concentration and total amount emissions by model year suggests that in-use emission differences between well maintained and badly maintained vehicles are larger than the age-dependent deterioration of emissions. In addition, relatively new high polluting vehicles are the greatest contributors to fleet emissions with, for example, 46.55% of carbon monoxide fleet emissions being produced by the top quintile high emitting vehicles from model years 2000-2004. Therefore, fleet emissions could be significantly reduced if new highly polluting vehicles were subject to effective emissions testing followed by appropriate remedial action.
Keywords: remote sensing, vehicle emission, characterization
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