Institute of Environmental Assessment and Water Research, Spanish Research Council (IDAEA-CSIC) , c/Jordi Girona 18-26, 08034 Barcelona, Spain.
Environ Sci Technol. 2014 Jul 15;48(14):8069-77. doi: 10.1021/es502496s. Epub 2014 Jun 27.
The abatement of road dust emissions is currently a major challenge for sustainable transportation, causing exceedances of limits on particulate matter (PM) and high population exposures to mineral dust and metals. Mitigation measures have been proposed such as improved street cleaning and the use of dust suppressants. This study evaluated, for the first time, the effectiveness of calcium-magnesium acetate (CMA) and MgCl2 in reducing road dust emissions in a Mediterranean city. During a two-month campaign, a typical urban road in the city of Barcelona was sprayed, and changes in PMx levels and components were monitored at four traffic sites and one background monitoring sites. The integrated results indicate no statistically significant effectiveness of dust suppressants on PM10 and PM2.5-10 levels. Episodic reductions of Al, K, Mg, Cr, Li, Cu, and Zn were observed during CMA applications, but they were not systematically statistically significant over different stations and spreading days. MgCl2 days showed lower PM10 mean concentrations, but these reductions were not statistically significant and were not supported by significant drops in mineral and brake-wear metals. Based on our literature review, it can be postulated that the higher the road dust loading, the higher the dust suppressant effectiveness.
道路扬尘排放的减少是可持续交通的主要挑战之一，其导致了颗粒物 (PM) 限值的超标和高人群暴露于矿物尘和金属。已经提出了一些缓解措施，例如改进街道清洁和使用抑尘剂。本研究首次评估了在一个地中海城市中，醋酸钙镁（CMA）和 MgCl2 减少道路扬尘排放的效果。在为期两个月的活动中，对巴塞罗那市的一条典型城市道路进行了喷洒，在四个交通站点和一个背景监测站点监测了 PMx 水平和成分的变化。综合结果表明，抑尘剂对 PM10 和 PM2.5-10 水平没有统计学上的显著效果。在 CMA 应用期间观察到 Al、K、Mg、Cr、Li、Cu 和 Zn 的偶发性减少，但在不同站点和散布日之间没有系统的统计学意义。MgCl2 日显示出较低的 PM10 平均浓度，但这些降低没有统计学意义，并且没有得到矿物和刹车片金属明显下降的支持。根据我们的文献综述，可以假设道路扬尘负荷越高，抑尘剂的效果就越高。
