Huge challenges of improving ozone pollution in China: high regional background ozone concentrations calculated from observational data

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution Pub Date : 2025-03-28 DOI:10.1016/j.envpol.2025.126162

Yusi Liu, Yang Zhang, Fan Yang, Linlin Liang, Guiqian Tang

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引用次数: 0

Abstract

Understanding current regional background ozone concentrations can clarify their ability to meet air quality standards. In this study, the regional background ozone concentration was defined as the stable concentration of ozone caused by large-scale winds. Therefore, on the basis of an experimental equation, the national regional background ozone concentration was calculated via national hourly ozone concentration and wind speed observational data from 2015 to 2023. This study divided China into five regions according to the spatial distributions of climatic zones and regional background ozone concentrations. The regional background ozone concentration in China was low in the northeast (77.3 ± 5.7 μg/m³) and southeast monsoon (79.3 ± 5.2 μg/m³) regions and high in the southwest monsoon region (94.5 ± 8.0 μg/m³) and northern region (95.3 ± 7.1 μg/m³). The regional background concentration of the plateau region was considered high at the national level (99.6 ± 4.8 μg/m³). This study highlights that the regional background ozone concentration in plains is related to soil NOx, and that that in plateaus is related to altitude (stratospheric intrusion and strong radiation). Cross-border transport from Southeast Asia contributed significantly to regional background ozone in Southwest China. Given the differences in regional background ozone concentrations, the ability to meet national air quality standards varies across regions. The plateau, northern, and southwest monsoon regions presented high regional background ozone concentrations, which indicates that these regions are under great pressure to reduce emissions.

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来源期刊

Environmental Pollution 环境科学-环境科学

CiteScore

16.00

自引率

6.70%

发文量

2082

审稿时长

2.9 months

期刊介绍： Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.