Kim, Kyung Hwan Lee, Seung-Bok Woo, Daekwang Bae, Gwi-Nam 2024-01-20T05:34:21Z 2024-01-20T05:34:21Z 2021-09-05 2015-11 1309-1042 https://pubs.kist.re.kr/handle/201004/124800 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 microscale 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 similar to 10 times higher than that at 200 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 (similar to 15 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 2.0 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. Copyright (c) 2015 Turkish National Committee for Air Pollution Research and Control. Production and hosting by Elsevier B.V. All rights reserved. English TURKISH NATL COMMITTEE AIR POLLUTION RES & CONTROL-TUNCAP POLYCYCLIC AROMATIC-HYDROCARBONS AIR-POLLUTION IMPACTS ULTRAFINE PARTICLES VEHICLE EMISSIONS SIZE DISTRIBUTION PARTICULATE MATTER LOS-ANGELES WIDE AREA URBAN PM2.5 Influence of wind direction and speed on the transport of particle-bound PAHs in a roadway environment Article 10.1016/j.apr.2015.05.007 1 ATMOSPHERIC POLLUTION RESEARCH, v.6, no.6, pp.1024 - 1034 ATMOSPHERIC POLLUTION RESEARCH 6 6 1024 1034 scie scopus 000372527700013 2-s2.0-84954475431 Environmental Sciences Environmental Sciences & Ecology Article POLYCYCLIC AROMATIC-HYDROCARBONS AIR-POLLUTION IMPACTS ULTRAFINE PARTICLES VEHICLE EMISSIONS SIZE DISTRIBUTION PARTICULATE MATTER LOS-ANGELES WIDE AREA URBAN PM2.5 Wind speed Wind direction Urban air pollution On-road measurement Particle-bound PAHs