Influence of regional emission controls on the chemical composition, sources, and size distributions of submicron aerosols: Insights from the 2014 Nanjing Youth Olympic Games
2022
Wang, Junfeng | Ge, Xinlei | Sonya, Collier | Ye, Jianhuai | Lei, Yali | Chen, Mindong | Zhang, Qi
High-intensity emission controls were implemented in Nanjing and in 8 surrounding cities to ensure good air quality during the 2014 summer Youth Olympic Games (YOG). An Aerodyne soot-particle aerosol mass spectrometer (SP-AMS) was deployed at a downwind site of downtown Nanjing to investigate the chemical composition, sources, and size distribution of submicron aerosols (PM₁), in response to emission control policies. However, results show that emission controls played a negligible role in reducing PM₁ concentration during the YOG period, yet primary precursors such as NOₓ and SO₂ were decreased by 10–20%. Low wind speed, high relative humidity, and high ozone (O₃) concentration likely play a significant role in the production and accumulation of the oxygenated organic aerosol (OOA) and the secondary inorganic aerosols (SIA) in summer Nanjing. We propose that long-term regional emission reduction could be a solution for future air pollution mitigation strategies in downwind cities of the YRD region, and that seasonal meteorological characteristics in a specific region should be considered before emission control policies are made.
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