Variations in Vertical Distributions of O 3 , Its Precursors, and Formation Sensitivity in Beijing, China, Based on Ground-Based Remote Sensing

作者：Xiangguang Ji, Qihou Hu, Xiaohan Wang, Bingsen Deng, Zhenfeng Sun, Zhuang Wang, Qianqian Hong, Shiyao Tang, Wen Zhang, Chengzhi Xing, Chengxin Zhang, Cheng Liu · 发表于：Environmental Science & Technology · 年份：2025 · DOI：10.1021/acs.est.5c04527 · 被引用次数：8 · 研究领域：Atmospheric chemistry and aerosols、Air Quality and Health Impacts、Atmospheric Ozone and Climate

High Resolution Image Download MS PowerPoint Slide Developing effective emission reduction strategies to mitigate ozone (O 3 ) pollution requires a comprehensive understanding of its dynamics and formation sensitivity. Herein, the continuous vertical profiles of O 3 and its precursors (formaldehyde and nitrogen dioxide), and O 3 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 3 concentration within the boundary layer was observed at an altitude of 100–300 m. Concentrations of O 3 and its precursors declined from 2018 to 2021, followed by slight increases in 2022 and 2023. The combined temporal percentages of O 3 formation under the NO x -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 x -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.