VITO, Flemish Institute for Technological Research Boeretang 200, B-2400 Mol, Belgium.
Sci Total Environ. 2012 Aug 1;431:307-13. doi: 10.1016/j.scitotenv.2012.05.054. Epub 2012 Jun 14.
Simultaneous measurements of ultrafine particles (UFPs) were carried out at four sampling locations situated within a 1 km(2) grid area in a Belgian city, Borgerhout (Antwerp). All sampling sites had different orientation and height of buildings and dissimilar levels of anthropogenic activities (mainly traffic volume). The aims were to investigate: (i) the spatio-temporal variation of UFP within the area, (ii) the effect of wind direction with respect to the volume of traffic on UFP levels, and (iii) the spatial representativeness of the official monitoring station situated in the study area. All sampling sites followed similar diurnal patterns of UFP variation, but effects of local traffic emissions were evident. Wind direction also had a profound influence on UFP concentrations at certain sites. The results indicated a clear influence of local weather conditions and the more dominant effect of traffic volumes. Our analysis indicated that the regional air quality monitoring station represented the other sampling sites in the study area reasonably well; temporal patterns were found to be comparable though the absolute average concentrations showed differences of up to 35%.
在比利时城市博尔赫霍特（安特卫普）的一个 1 平方公里网格区域内的四个采样点同时进行了超细颗粒 (UFPs) 的测量。所有采样点的建筑物方位和高度不同，人为活动水平（主要是交通量）也不同。目的是调查：(i) 该区域内 UFP 的时空变化，(ii) 风向相对于交通量对 UFP 水平的影响，以及 (iii) 位于研究区域的官方监测站的空间代表性。所有采样点的 UFP 变化都遵循相似的日变化模式，但局部交通排放的影响明显。风向对某些地点的 UFP 浓度也有深远的影响。结果表明，当地天气条件和交通量的更主导作用对 UFP 浓度有明显影响。我们的分析表明，区域空气质量监测站很好地代表了研究区域内的其他采样点；尽管绝对平均浓度存在差异，最高可达 35%，但时间模式具有可比性。
