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[Characteristics and Control Strategies on Summertime Peak Ozone Concentration in Shanghai]
Ru-Sha Yan1, Hong-Li Wang1, Cheng Huang1
1State Environmental Protection Key Laboratory of Formation and Prevention of the Urban Air Complex, Shanghai Academy of Environmental Sciences, Shanghai 200233, China.
Huan Jing Ke Xue= Huanjing Kexue
|July 26, 2021
Summary
Ozone pollution in Shanghai is increasing despite PM2.5 reductions. Regional control of volatile organic compounds (VOCs) and nitrogen oxides (NOx) is crucial for reducing ozone peaks.
Area of Science:
- Atmospheric Chemistry
- Environmental Science
- Air Quality Management
Background:
- Shanghai experiences frequent ozone (O3) pollution events, with July 2017 seeing a 64.5% exceedance rate in the Yangtze River Delta.
- Despite declining PM2.5, rising O3 necessitates understanding its occurrence patterns and control strategies.
Purpose of the Study:
- To analyze the causes of O3 pollution events in Shanghai and the Yangtze River Delta.
- To evaluate the effectiveness of precursor emission control strategies for O3 reduction.
Main Methods:
- Analysis of ozone precursor concentrations (NO2, VOCs) and meteorological data.
- WRF-CMAQ scenario simulations to model O3 responses to emission reductions.
Main Results:
- O3 pollution is driven by high temperatures, low humidity, low wind speeds, and high precursor emissions.
- Reducing precursor emissions in Shanghai alone has limited impact on regional O3 pollution.
- A 30% VOC reduction in Shanghai and nine neighboring cities could decrease peak O3 by 7.2%.
Conclusions:
- Regional joint control strategies are essential for mitigating widespread O3 pollution events.
- Reducing VOCs in 17 cities could lower Shanghai's peak O3 by 7.8%.
- A VOCs:NOx reduction ratio exceeding 3:1 is recommended to prevent O3 increases.
