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首页> 外文期刊>Aerosol and Air Quality Research >Characteristics of PM2.5 and Assessing Effects of Emission–Reduction Measures in the Heavy Polluted City of Shijiazhuang, before, during, and after the Ceremonial Parade 2015
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Characteristics of PM2.5 and Assessing Effects of Emission–Reduction Measures in the Heavy Polluted City of Shijiazhuang, before, during, and after the Ceremonial Parade 2015

机译：石家庄重污染城市2015年典礼游行前后的PM2.5特征及减排措施评估

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摘要

The measurement of PM2.5 was conducted from 15th August to 17th September, 2015 in Shijiazhuang, China, covering the period of a ceremonial parade. The PM2.5 concentrations and the major chemical components were analyzed. The concentrations of PM2.5was 26.5 μg m–3 during control, which were 57.0% and 51.1% lower compared to before and after control, respectively. The lowest concentrations of elements and water-soluble ions were also found during control with a decreasing tread of 31.1%–44.2%, and 57.1%–64.2%, respectively. Two typical pollution episodes characterized by significantly elevated PM2.5concentration were found during no control due to the combination of no emission-reduction measures and unfavorable weather conditions. The mass percentage of secondary inorganic ions was larger during no control (38.1%–40.3%), pointing to the strong contribution of atmospheric chemical processes. The NO3–/SO42– ratios were 0.85, 0.94, and 0.85 before, during, and after control, respectively, and the elevated ratios during control indicate a greater proportion of the PM2.5 originated from vehicle exhaust. The WRF-CMAQ modeling system was also used to assess the effectively of emission reduction measures and weather conditions. The results indicated that the PM2.5concentration increased by 21.6% and 32.1% if no emission-reduction measures were taken and weather conditions in 2014 were used.
机译：PM2.5的测量于2015年8月15日至9月17日在中国石家庄进行，涵盖了仪仗游行的时间。分析了PM2.5的浓度和主要化学成分。对照期间PM2.5的浓度为26.5μgm–3，分别比对照之前和之后分别降低57.0％和51.1％。在控制期间，元素和水溶性离子的浓度最低，分别降低了31.1％–44.2％和57.1％–64.2％。由于没有减排措施和不利的天气条件的结合，在没有控制的情况下发现了两个典型的污染事件，其特征是PM2.5浓度显着升高。在无控制的情况下，次要无机离子的质量百分比较大（38.1％–40.3％），表明大气化学过程的重要贡献。在控制之前，期间和之后，NO3– / SO42–的比率分别为0.85、0.94和0.85，而在控制期间的较高比率表明来自车辆尾气的PM2.5比例更高。 WRF-CMAQ建模系统还用于评估减排措施和天气状况的有效性。结果表明，如果不采取减排措施并且使用2014年的天气条件，则PM2.5的浓度将分别增加21.6％和32.1％。

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