西安臭氧与PM2.5数据集(2014-2023年)
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研究分析了2015-2021年西安空气污染物的地面监测数据,发现大约三分之二的时间超标PM2.5或O3浓度。冬季霾中臭氧污染增加,主要是因为高反应性氧化挥发性有机化合物(OVOCs),特别是甲醛,加上NO2减少。2020年疫情封锁期间的NO2减少提供了实际控制措施的证据,表明仅控制NOx不足以减少臭氧污染。模型模拟结果表明,仅通过减少NO2不足以减少臭氧和SOA的形成,需要更积极地减少其前体气体。
This study analyzed ground-based monitoring data of air pollutants in Xi'an from 2015 to 2021, and found that PM2.5 or O3 concentrations exceeded the standard approximately two-thirds of the time. Ozone pollution in winter haze increased, mainly due to highly reactive oxidized volatile organic compounds (OVOCs, particularly formaldehyde), coupled with the reduction of NO₂. The reduction of NO₂ during the 2020 COVID-19 lockdown provided evidence for actual control measures, indicating that solely controlling NOₓ is insufficient to mitigate ozone pollution. Model simulation results show that merely reducing NO₂ is insufficient to curtail the formation of ozone and secondary organic aerosols (SOA), and more aggressive reductions of their precursor gases are required.




