[Comparative Analysis of Ambient Ozone and Its Background Concentration in Beijing in Recent Years].

Q2 Environmental Science
Yun-Feng Li, Ji-Lin Tang, Yuan-Yuan Ji, Ya-Fei Wang, Hong Li, Rui Gao
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引用次数: 0

Abstract

To understand the trends of O3 pollution changes and the contribution of regional background in Beijing in recent years, this study investigated the temporal variations of O3 mixing ratios and the exceedance of O3 pollution at different types of sites, such as urban, suburban, clean, regional, and transportation sites, based on the online monitoring data from 34 stations in Beijing from 2018 to 2022. The regional background estimation method proposed by the Texas Commission on Environmental Quality (TCEQ) was applied to calculate the contributions of regional background and local generation to O3. The results showed that the annual average value of O3 mixing ratios in Beijing was the highest in 2019, the lowest in 2021, and rebounded in 2022, from 2018 to 2022. Except for transportation sites, O3 mixing ratios in Beijing and all other types of sites exhibited decreasing trends. The highest monthly average value of O3 occurred in June and the monthly average values of clean sites were often higher than those of other sites. The proportions of O3 exceedance days and heavily polluted days varied over the last five years and days with high O3 pollution more often occurred at the clean site. The O3 exceedance days were mostly dominated by light pollution and the average O3 mixing ratios on heavily polluted days in 2020-2022 were greater than those in 2019. To exclude the influence of NO on the "titration" effect of O3, the TCEQ method was estimated by using the total oxidant Ox (Ox=O3+NO2) instead of O3. The results showed that both the regional background and the local generation in Beijing showed decreasing trends and the contribution of the regional background was significantly higher than that of the local generation. However, the contribution of the regional background decreased in the summer due to the enhancement of the photochemical activities. In general, although the O3 mixing ratios in Beijing had been decreasing from 2018 to 2022, no such trend was observed in the O3 mixing ratios on heavily polluted days. To achieve the goal of basically eliminating heavily polluted days in the 14th Five-Year Plan and to effectively control O3 pollution, it is recommended that Beijing should further optimize the joint prevention and control of atmosphere pollution in Beijing-Tianjin-Hebei and neighboring regions to reduce the contribution of regional background to O3 pollution while strengthening the control of local O3 precursor emissions.

[北京近年来大气臭氧及其本底浓度的比较分析]。
为了解北京市近年来O3污染的变化趋势和区域背景的贡献,基于2018 - 2022年北京34个站点的在线监测数据,研究了城市、郊区、清洁、区域和交通等不同类型站点的O3混合比和O3污染超标的时间变化。采用德克萨斯州环境质量委员会(TCEQ)提出的区域背景估算方法,计算区域背景和本地生成对O3的贡献。结果表明,北京市臭氧混合比年平均值在2019年最高,在2021年最低,并在2022年反弹,从2018年到2022年。除交通站点外,北京和其他所有类型站点的O3混合比均呈下降趋势。O3的月平均值在6月份最高,且干净站点的月平均值往往高于其他站点。近5年臭氧超标日和重污染日的比例有所不同,高污染日多出现在洁净场地。2020-2022年O3超标日以光污染为主,重污染日平均O3混合比大于2019年。为了排除NO对O3“滴定”效果的影响,用总氧化剂Ox (Ox=O3+NO2)代替O3来估算TCEQ法。结果表明:北京市的区域背景和地方背景均呈下降趋势,区域背景的贡献显著高于地方背景的贡献;然而,由于光化学活动的增强,夏季区域背景的贡献减小。总体来看,2018 - 2022年北京市臭氧混合比呈下降趋势,但重污染日的臭氧混合比无下降趋势。为实现“十四五”规划基本消除重污染天数的目标,有效控制O3污染,建议北京进一步优化京津冀及周边地区大气污染联防联控,在加强局部O3前体排放控制的同时,降低区域背景对O3污染的贡献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
环境科学
环境科学 Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
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