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The Impacts of Emission Control and Regional Transport on PM2.5 Ions and Carbon Components in Nanjing during the 2014 Nanjing Youth Olympic Games
Derong Zhou1,2, Bing Li2, Xin Huang1,3, Aki Virkkula1,3,4,5, Haisuo Wu2, Qiuyue Zhao2, Jie Zhang2, Qiang Liu1, Li Li2, Chunyan Li2, Feng Chen2, Siyu Yuan2, Yuezhen Qiao2, Guofeng Shen2, Aijun Ding1,3
1 Joint International Research Laboratory of Atmospheric and Earth System Sciences & School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China
2 Jiangsu Key Laboratory of Environmental Engineering, Jiangsu Academy of Environmental Sciences, Nanjing 210036, China
3 Collaborative Innovation Center of Climate Change, Jiangsu Province, China
4 Department of Physics, University of Helsinki, FI-00014 Helsinki, Finland
5 Finnish Meteorological Institute, FI-00560, Helsinki, Finland
- Strict control measures significantly improved air quality in Nanjing during the YOG.
- Secondary pollutants from regional scale dominated air pollution during the YOG.
- Regional collaborative control is needed for an effective improvement of air quality.
Highly time-resolved measurements of water soluble ions, organic and elemental carbon concentrations in the particle diameter size range Dp < 2.5 µm (PM2.5) were performed at a downwind urban site in Nanjing in the western part of the Yangtze River Delta (YRD) in eastern China during the 2014 Youth Olympic Games (YOG). In this study, we discuss the impacts of emission control in Nanjing and the surrounding areas during the YOG and regional/long-range transport on PM2.5 pollution in Nanjing. The average concentrations of NO3–, SO42–, NH4+ were 12.1 ± 9.9, 16.5 ± 9.2, 9.0 ± 5.4 µg m–3 during the YOG, and increased 34.3%, 53.7%, 43.9% after the YOG, respectively. The control of construction or on-road soil dust and control of industry led to the decrease of Ca2+ concentration by 55% and SO2 concentration by 46%. However, SO42– concentrations remained at relatively high levels, suggesting a significant impact of regional pollution to secondary fine particles in Nanjing. Strong correlations between OC and EC were observed during and after the YOG. A higher percentage (41%) of secondary organic carbon in Nanjing during the YOG periods was consistent with high potential photochemistry and low contributions from coal combustion. Lagrangian dispersion modelling results proved that the city clusters along the Nanjing and Shanghai axis were the major source region for high PM2.5 pollution in upwind Nanjing. This work shows that short-term strict control measures could improve the air quality, especially that affected by the primary pollutants; however, regional collaborative control strategy across administrative borders in the YRD is needed for a substantial improvement of air quality.
Air quality; Fine particulate matter; Emission control; Regional transport; The 2014 Nanjing Youth Olympic Games.