School of Humanities, Economics and Law, Northwestern Polytechnical University, Xi'an 710129, China; Key Laboratory of Aerosol Chemistry and Physics, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China.
Key Laboratory of Aerosol Chemistry and Physics, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China; CAS Center for Excellence in Quaternary Science and Global Change, Xi'an 710061, China.
Sci Total Environ. 2020 Jun 1;719:137547. doi: 10.1016/j.scitotenv.2020.137547. Epub 2020 Feb 24.
The Ministry of Environmental Protection released a Joint Action Plan for Control of Air Pollution (Hereafter, Joint Action Plan, JAP), to reduce PM concentrations in the Beijing-Tianjin-Hebei region (BTH) during the winter of 2017. To investigate the effectiveness of the controls, we deployed an aerosol chemical speciation monitor and collected filter samples at Xianghe, a representative site for the BTH, to characterize the aerosol composition during the implementation of the JAP. Those results were compared with earlier data obtained from a literature survey and reanalysis of studies in the BTH. During several pollution episodes in the control period, the major aerosol types changed relative to the earlier studies from sulfate, oxygenated organic aerosol, and coal combustion organic aerosol to nitrate and biomass burning organic aerosol. The dominant secondary inorganic aerosol species during the JAP changed from sulfate to nitrate, and the main source for primary organic aerosol switched from coal combustion to biomass burning. These changes can be explained by the fact that the JAP controls targeted coal combustion and SO but not biomass burning or NO emissions. Our evaluation of the control measures provides a scientific basis for developing new policies in the future.
环境保护部发布了《京津冀区域 2017 年秋冬季大气污染综合治理攻坚行动方案》（以下简称“攻坚行动方案”），以降低京津冀地区（BTH）冬季 PM 浓度。为了调查控制措施的有效性，我们在香河县部署了气溶胶化学物质监测仪，并采集了过滤器样品，以研究 BTH 地区气溶胶的组成。这些结果与之前从文献调查和 BTH 研究的再分析中获得的数据进行了比较。在控制期间的几次污染事件中，与之前的研究相比，主要的气溶胶类型从硫酸盐、含氧有机气溶胶和煤燃烧有机气溶胶转变为硝酸盐和生物质燃烧有机气溶胶。在攻坚行动方案期间，主要的二次无机气溶胶物种从硫酸盐转变为硝酸盐，而主要的一次有机气溶胶来源从煤燃烧转变为生物质燃烧。这些变化可以解释为攻坚行动方案的控制措施针对的是煤燃烧和 SO，但不是生物质燃烧或 NO 排放。我们对控制措施的评估为未来制定新政策提供了科学依据。
