Ji Xiangguang, Hu Qihou, Wang Xiaohan, Deng Bingsen, Sun Zhenfeng, Wang Zhuang, Hong Qianqian, Tang Shiyao, Zhang Wen, Xing Chengzhi, Zhang Chengxin, Liu Cheng
State Key Laboratory of Opto-Electronic Information Acquisition and Protection Technology, Anhui University, Hefei 230601, China.
Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institute of Physical Science and Information Technology, Anhui University, Hefei 230601, China.
Environ Sci Technol. 2025 Jul 8;59(26):13333-13342. doi: 10.1021/acs.est.5c04527. Epub 2025 Jun 26.
Developing effective emission reduction strategies to mitigate ozone (O) pollution requires a comprehensive understanding of its dynamics and formation sensitivity. Herein, the continuous vertical profiles of O and its precursors (formaldehyde and nitrogen dioxide), and O formation sensitivity, as well as their temporal variations, were investigated by ground-based remote sensing observations at urban and rural sites in Beijing, China, from 2018 to 2023. The maximum monthly mean O concentration within the boundary layer was observed at an altitude of 100-300 m. Concentrations of O and its precursors declined from 2018 to 2021, followed by slight increases in 2022 and 2023. The combined temporal percentages of O formation under the NO-limited and transition regimes were accessed at both sites. These percentages for the boundary layer condition have reached 69.2% at the rural site during summer 2023. The trend toward a shift from the VOC-limited to NO-limited regime was observed. This shift occurred at a much faster rate at the rural site than at the urban site. The findings of the study indicate that a predominantly VOC-limited regime is expected to be confined to a narrow near-surface layer within the urban areas of Beijing by 2030 if current trends continue.
制定有效的减排策略以减轻臭氧（O）污染需要全面了解其动态变化和形成敏感性。在此，利用2018年至2023年在中国北京城乡站点进行的地基遥感观测，研究了臭氧及其前体（甲醛和二氧化氮）的连续垂直廓线、臭氧形成敏感性及其时间变化。边界层内月平均臭氧浓度最大值出现在海拔100 - 300米处。臭氧及其前体的浓度在2018年至2021年下降，随后在2022年和2023年略有上升。在两个站点都获取了NO限制和过渡状态下臭氧形成的综合时间占比。2023年夏季，农村站点边界层条件下这些占比已达69.2%。观测到了从VOC限制状态向NO限制状态转变的趋势。这种转变在农村站点发生的速度比城市站点快得多。研究结果表明，如果当前趋势持续下去，到2030年，在北京城区，主要的VOC限制状态预计将局限于狭窄的近地表层。
