Tang Junting, Song Dangyu, Ji Wanwan, Fan Liudan
Institute of Resource and Environment, Henan Polytechnic University, Jiaozuo, China.
ACS Omega. 2021 Jan 5;6(2):1149-1159. doi: 10.1021/acsomega.0c04169. eCollection 2021 Jan 19.
Various measures for reducing air pollution have been promulgated since 2013 in China. To investigate the synergistic results of emission control and meteorological environment, PM samples collected from October 2013 to July 2016 and November 2018 to October 2019 in Jiaozuo city were analyzed for their compositions, secondary species (Ss) variations, and factors changing for Ss formation. The results showed that the concentrations of sulfate, nitrate, ammonium, and secondary organic aerosols (SOAs) generally decreased over the same seasonal period during these years. In addition, the concentrations and proportions of each Ss increased with the increase in the PM level in these years, implying that although PM levels have been reduced by various control policies, Ss formation would remain the major contributor to PM elevations. The enhanced effects of gas-phase reactions on intensification of sulfate, SOA, and PM were observed in 2018-2019, which was consistent with the elevation of nitrate and SOA at PM levels of >150 μg/m. Only sulfate in all PM levels sharply decreased after 2015, showing the fine effect of coal-related pollution control and the importance of collaborative control of NO , volatile organic compounds, and organic aerosol emissions with SO emissions in the future.
自2013年以来，中国已颁布了各种减少空气污染的措施。为了研究排放控制与气象环境的协同效果，对2013年10月至2016年7月以及2018年11月至2019年10月在焦作市采集的PM样本进行了成分分析、二次物种（Ss）变化分析以及Ss形成的影响因素分析。结果表明，这些年中，在相同季节期间，硫酸盐、硝酸盐、铵盐和二次有机气溶胶（SOA）的浓度总体上呈下降趋势。此外，这些年中，各Ss的浓度和比例随着PM水平的升高而增加，这意味着尽管通过各种控制政策降低了PM水平，但Ss的形成仍是PM升高的主要因素。在2018 - 2019年观察到气相反应对硫酸盐、SOA和PM强化的增强作用，这与PM水平>150μg/m时硝酸盐和SOA的升高一致。2015年后，所有PM水平中的硫酸盐均急剧下降，这显示了与煤炭相关的污染控制取得的良好效果以及未来协同控制NO 、挥发性有机化合物和有机气溶胶排放与SO排放的重要性。
