Atmospheric Pollution Research | |
Influence of wind direction and speed on the transport of particle-bound PAHs in a roadway environment | |
Kyung HwanKim1  | |
关键词: Wind speed; Wind direction; Urban air pollution; On-road measurement; Particle-bound PAHs; | |
DOI : 10.1016/j.apr.2015.05.007 | |
学科分类:农业科学(综合) | |
来源: Dokuz Eylul Universitesi * Department of Environmental Engineering | |
【 摘 要 】
The influence of wind direction and speed on the transport of vehicular air pollutants was investigated using a mobile laboratory in an urban area. We considered three spatial scales covering typical transport phenomena observed in urban areas: micro-scale (a few tens of meters), middle-scale (a few hundred meters) and neighborhood-scale (a few kilometers). Particle-bound polycyclic aromatic hydrocarbons (PAHs) were selected as an indicator of vehicle emissions in the roadway environment. From the micro-scale measurements, we found a significant difference in the concentration of particle-bound PAHs within a small spatial area, on a two-way road, due to the effect of wind direction when the prevailing wind direction was constant. In the middle-scale experiments, an exponential decrease in the concentration of particle-bound PAHs was observed with distance from the intersection in the direction of the prevailing wind, which is consistent with the results of previous studies. The concentration of particle-bound PAHs near the road was â¼10 times higher than that at 200Â m away from the road due to the significantly low background concentration, indicating that particle-bound PAHs are a good indicator of vehicle emissions in a roadway environment. From long-distance (â¼15Â km) traveling measurements made over 14 days, we found that the average concentration of particle-bound PAHs on the road decreased as the prevailing wind speed increased at the neighborhood-scale, when the wind speed was higher than 2.0Â m/s. This analysis, over three spatial scales, will be helpful in understanding the effect of wind on air pollution in a roadway environment in urban areas.
【 授权许可】
CC BY
【 预 览 】
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RO201902191290110ZK.pdf | 2345KB | download |