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Discussion papers
https://doi.org/10.5194/acp-2019-407
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-407
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 14 May 2019

Research article | 14 May 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Significant reduction of PM2.5 in eastern China due to regional-scale emission control: Evidences from the SORPES station, 2011–2018

Aijun Ding1,2, Xin Huang1,2, Wei Nie1,2, Xuguang Chi1,2, Zheng Xu1,2, Longfei Zheng1,2, Zhengning Xu1,2, Yuning Xie1,2,a, Ximeng Qi1,2, Yicheng Shen1,2, Peng Sun1,2, Jiaping Wang1,2, Lei Wang1,2, Jiannin Sun1,2, Xiu-Qun Yang1,2, Wei Qin3, Xiangzhi Zhang3,4, Wei Cheng3, Weijing Liu5, Liangbao Pan4, and Congbin Fu1,2 Aijun Ding et al.
  • 1Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing, 210023, China
  • 2Jiangsu Provincial Collaborative Innovation Center of Climate Change, Nanjing, China
  • 3Jiangsu Environmental Monitoring Center, Department of Ecology and Environment of Jiangsu Province, Nanjing, China
  • 4Department of Ecology and Environment of Jiangsu Province, Nanjing, China
  • 5Jiangsu Provincial Academy of Environmental Science, Department of Ecology and Environment of Jiangsu Province, Nanjing, China
  • anow at: School of Geographic Sciences, East China Normal University, China

Abstract. Haze pollution caused by PM2.5 is the largest air quality concern in China in recent years. Long-term measurements of PM2.5 and the precursors and chemical speciation is crucially important for evaluating the efficiency of emission control, understanding formation and transport of PM2.5 associated with the change of meteorology and for accessing the impact of human activities to regional climate change. Here we reported long-term continuous measurements of PM2.5, chemical components, and their precursors at a regional background station, the Station for Observing Regional Processes of the Earth System (SORPES), in Nanjing eastern China since 2011. We found that PM2.5 at the station has experienced a substantial decrease (−9.1 %/yr), accompanied with even much significant reduction of SO2 (−16.7 %/yr), since the national "Ten measures" for air took action in 2013. Control of open biomass burning and fossil-fuel combustion are the two dominant factors that influence the PM2.5 reduction in early summer and winter, respectively. In cold season (November–January), increased nitrate fraction was observed with more NH3 available from a substantial reduction of sulfate, and the change of year-to-year meteorology contributed to 24 % of the PM2.5 decrease since 2013. This study highlights several important implications on air pollution control policy in China.

Aijun Ding et al.
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Short summary
Based on continuous measurement at the SORPES statin in Nanjing, eastern China, we report the trend of PM2.5 and relevant chemical species there since 2011. We found significant reduction of PM2.5 in both winter and early summer due to emission reduction of fossil fuel combustion and open biomass burning, respectively. Reduction of fossil fuel combustions contributed to 76 % of the wintertime PM2.5 decrease with the left 24 % caused by the change of meteorology.
Based on continuous measurement at the SORPES statin in Nanjing, eastern China, we report the...
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