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9-year trends of PM10 sources and oxidative potential in a rural background site in France
Atmospheric Chemistry and Physics ( IF 5.2 ) Pub Date : 2021-11-29 , DOI: 10.5194/acp-2021-839
Lucille Joanna Borlaza , Samuël Weber , Anouk Marsal , Gaëlle Uzu , Véronique Jacob , Jean-Luc Besombes , Mélodie Chatain , Sébastien Conil , Jean-Luc Jaffrezo

Abstract. Long-term monitoring at sites with relatively low particulate pollution could provide an opportunity to identify changes in pollutant concentration and potential effects of current air quality policies. In this study, a 9-year sampling of PM10 (particles with an aerodynamic diameter below 10 µm) was performed in a rural background site in France from February 28, 2012 to December 22, 2020. The Positive Matrix Factorization (PMF) method was used to apportion sources of PM10 based on quantified chemical constituents and specific chemical tracers from collected filters. Oxidative potential (OP), an emerging health-metric that measures PM capability to potentially cause anti-oxidant imbalance in the lung, was also measured using two acellular assays: dithiothreitol (DTT) and ascorbic acid (AA). The contribution of PMF-resolved sources to OP were also estimated using multiple linear regression (MLR) analysis. In terms of mass contribution, the dominant sources are secondary aerosols (nitrate- and sulphate-rich), associated with long-range transport (LRT). However, in terms of OP contributions, the main drivers are traffic, mineral dust, and biomass burning factors. There is also some OP contribution apportioned to the sulphate- and nitrate-rich sources influenced by processes and aging during LRT that could have encouraged mixing with other anthropogenic sources. The study indicates much lower OP values than in urban areas. A substantial decrease (58 % reduction from year 2012 to 2020) in the mass contributions from the traffic factor was found, however, this is not clearly reflected in its OP contribution. Nevertheless, the findings in this long-term study in the OPE site could signal effectiveness of implemented emission control policies, as also seen in other long-term studies conducted in Europe, mainly for urban areas.

中文翻译:

法国农村背景地点 PM10 来源和氧化潜力的 9 年趋势

摘要。在颗粒物污染相对较低的地点进行长期监测可以提供一个机会,以确定污染物浓度的变化和当前空气质量政策的潜在影响。在这项研究中,2012 年 2 月 28 日至 2020 年 12 月 22 日在法国农村背景地点对 PM 10(空气动力学直径低于 10 µm 的颗粒)进行了 9 年采样。正矩阵分解 (PMF) 方法用于分配 PM 10 的来源基于量化的化学成分和收集的过滤器中的特定化学示踪剂。氧化电位 (OP) 是一种新兴的健康指标,可测量 PM 可能导致肺中抗氧化失衡的能力,也使用两种脱细胞测定法进行测量:二硫苏糖醇 (DTT) 和抗坏血酸 (AA)。还使用多元线性回归 (MLR) 分析估计了 ​​PMF 解析源对 OP 的贡献。就质量贡献而言,主要来源是与长程传输 (LRT) 相关的二次气溶胶(富含硝酸盐和硫酸盐)。然而,就 OP 贡献而言,主要驱动因素是交通、矿物粉尘和生物质燃烧因素。也有一些 OP 贡献分配给受 LRT 过程和老化影响的富含硫酸盐和硝酸盐的来源,这可能会鼓励与其他人为来源的混合。该研究表明 OP 值远低于城市地区。发现交通因素对质量贡献的显着减少(从 2012 年到 2020 年减少了 58%),但是,这并没有清楚地反映在其 OP 贡献中。尽管如此,这项在 OPE 场地进行的长期研究的结果可能表明所实施的排放控制政策的有效性,正如在欧洲进行的其他长期研究(主要针对城市地区)中所见。发现交通因素对质量贡献的显着减少(从 2012 年到 2020 年减少了 58%),但是,这并没有清楚地反映在其 OP 贡献中。尽管如此,这项在 OPE 场地进行的长期研究的结果可能表明所实施的排放控制政策的有效性,正如在欧洲进行的其他长期研究(主要针对城市地区)中所见。发现交通因素对质量贡献的显着减少(从 2012 年到 2020 年减少了 58%),但是,这并没有清楚地反映在其 OP 贡献中。尽管如此,这项在 OPE 场地进行的长期研究的结果可能表明所实施的排放控制政策的有效性,正如在欧洲进行的其他长期研究(主要针对城市地区)中所见。
更新日期:2021-11-29
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