Evaluating urban PM10 pollution benefit induced by street cleaning activities
Evaluating urban PM10 pollution benefit induced by street cleaning activities
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DOI：
10.1016/j.atmosenv.2009.06.037
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发表时间：
2009-09-01
影响因子：
5
通讯作者：
Rodriguez, Pau
中科院分区：
文献类型：
--
作者：
Amato, Fulvio;Querol, Xavier;Rodriguez, Pau
尽管道路交通非废气排放造成城市颗粒物空气污染，但往往不受控制，而且有关铺装道路缓解措施有效性的信息仍然很少。本研究旨在评估机械清扫/水冲洗处理在减轻城市道路灰尘再悬浮方面的有效性，并量化环境 PM10 浓度的实际效益。为此，在巴塞罗那（西班牙）交通繁忙的中央道路上开展了一项具体活动，这座地中海城市因汽车密度高和经常缺乏降水而遭受交通相关污染。夜间，使用机械清扫机和高压水对所有车道和人行道进行了几次街道清洗。同时将 PM10 水平与四个参考城市背景空气质量站进行比较，以解释任何气象变化。在下风向测量地点。街道清洗处理后24小时内PM10浓度日均下降8.8μgm(-3)。然而，这种减少量有 3.7-4.9 μg m(-3) 是由于在逆风站点以及两个参考站点检测到的气象变化造成的。这表明有效减少4-5μg m(-3) (7-10%)可能与街道清洗效率有关。通过研究空气中 PM10 过滤器的化学成分，证实了道路灰尘再悬浮的缓解。 Cu、Sb、Fe 和矿物质的浓度相对于用作柴油尾气排放示踪剂的元素碳浓度显着降低。通过对经过处理和未经处理的区域进行定期采样，发现街道清洗在减少道路灰尘负荷方面具有很高的效率。 (C) 2009 Elsevier Ltd. 保留所有权利。
Despite their burden in urban particulate air pollution, road traffic non-exhaust emissions are often uncontrolled and information about the effectiveness of mitigation measures on paved roads is still scarce. The present study is aimed to evaluate the effectiveness of mechanical sweeping/water flushing treatments in mitigating urban road dust resuspension and to quantify the real benefit in terms of ambient PM10 concentrations. To this aim a specific campaign was carried out in a heavily trafficked central road of Barcelona (Spain), a Mediterranean city suffering from a traffic-related pollution, both for a high car density and a frequent lack of precipitation. Several street washings were performed by means of mechanical sweepers and pressure water during night in all traffic lanes and sidewalks. PM10 levels were simultaneously compared with four reference urban background air quality stations to interpret any meteorological variability. At the downwind measurement site. PM10 concentrations registered a mean daily decrease of 8.8 mu g m(-3) during the 24 h after street washing treatments. However 3.7-4.9 mu g m(-3) of such decrease were due to the meteorological variability detected at the upwind site, as well as at two of the reference sites. This reveals that an effective decrease of 4-5 mu g m(-3) (7-10%) can be related to street washing efficiency. Mitigation of road dust resuspension was confirmed by investigating the chemical composition of airborne-PM10 filters. Concentrations of Cu, Sb, Fe and mineral matter decrease significantly with respect to concentrations of elemental carbon, used as tracer for exhaust diesel emissions. High efficiency of street washing in reducing road dust loads was found by performing periodic samplings both on the treated and the untreated areas. (C) 2009 Elsevier Ltd. All rights reserved.