Significant reduction of PM 2.5 in eastern China due to regional-scale emission control: evidence from SORPES in 2011–2018

Ding, Aijun; Huang, Xin; Nie, Wei; Chi, Xuguang; Xu, Zheng; Zheng, Longfei; Xu, Zhengning; Xie, Yuning; Qi, Ximeng; Shen, Yicheng; Sun, Peng; Wang, Jiaping; Wang, Lei; Sun, Jianning; Yang, Xiu-Qun; Qin, Wei; Zhang, Xiangzhi; Cheng, Wei; Liu, Weijing; Pan, Liangbao; Fu, Congbin

Haze pollution caused by PMinline-formula2.5 is the largest air quality concern in China in recent years. Long-term measurements of PMinline-formula2.5 and the precursors and chemical speciation are crucially important for evaluating the efficiency of emission control, understanding formation and transport of PMinline-formula2.5 associated with the change of meteorology, and accessing the impact of human activities on regional climate change. Here we reported long-term continuous measurements of PMinline-formula2.5, 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 PMinline-formula2.5 at the station has experienced a substantial decrease (inline-formula−9.1 % yrinline-formula−1), accompanied by even a very significant reduction of inline-formulaSO2 (inline-formula−16.7 % yrinline-formula−1), since the national “Ten Measures of Air” took action in 2013. Control of open biomass burning and fossil-fuel combustion are the two dominant factors that influence the PMinline-formula2.5 reduction in early summer and winter, respectively. In the cold season (November–January), the nitrate fraction was significantly increased, especially when air masses were transported from the north. More inline-formulaNH3 available from a substantial reduction of inline-formulaSO2 and increased oxidization capacity are the main factors for the enhanced nitrate formation. The changes of year-to-year meteorology have contributed to 24 % of the PMinline-formula2.5 decrease since 2013. This study highlights several important implications on air pollution control policy in China.

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Ding, Aijun / Huang, Xin / Nie, Wei / et al: Significant reduction of PM2.5 in eastern China due to regional-scale emission control: evidence from SORPES in 2011–2018. 2019. Copernicus Publications.

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