Author(s)

Jingguo Wu ¹, Shiman Xue ²

Affiliation(s)

¹ Zhejiang Haimu Metallurgical Materials Co., Ltd. Beilun Branch, Ningbo, 315800, China
² Zhejiang Shenxi Testing Technology Co., Ltd. Zhenhai Branch, Ningbo, 315200, China

Corresponding Author

Jingguo Wu

ABSTRACT

Jincheng, a typical industrial city located at the southern end of the Taihang Mountains and surrounded by mountains, suffers from severe PM₂.₅ and O₃ compound pollution driven by both industrial emissions and basin terrain. Based on six-year (2020–2025) observations, this study identifies pollution episodes using the growth–peak–decline framework, and analyses their meteorological causes and regional transport contributions with HYSPLIT, PSCF and CWT. Results show that: (1) PM₂.₅ annual mean dropped from 46.4 to 30.0 μg/m³, while the 90th percentile of MDA8 O₃ fluctuated and then declined from 175.5 to 155.6 μg/m³. (2) According to the exceedance-day statistics, there were 197 PM₂.₅ exceedance days, 375 O₃ exceedance days and 6 compound pollution days; under the episode-identification framework, sensitivity tests showed that the numbers of steady-state accumulation, photochemical and compound episodes remained stable at about 78–80, 85–106 and 11–12, respectively. (3) CWT analysis indicates that regional transport dominates local accumulation: the regional CWT high-value zones are 90.3 vs. 65.4 μg/m³ for PM₂.₅, and 167.2 vs. 148.7 μg/m³ for O₃. (4) Enhanced atmospheric oxidizing capacity strengthens the coupled 'radiation–heterogeneous–oxidizing' cycle between PM₂.₅ and O₃. These findings highlight the 'basin amplifier' effect and provide a scientific basis for collaborative PM₂.₅–O₃ control.

KEYWORDS

PM₂.₅; O₃; Compound Pollution; Basin Terrain; Regional Transport

CITE THIS PAPER

Jingguo Wu, Shiman Xue. A Basin Amplifier: PM₂.₅ and O₃ Coupling in a Typical Industrial City, Northern China. Environment, Resource and Ecology Journal (2026). Vol. 10, No.1, 115-121. DOI: http://dx.doi.org/10.23977/erej.2026.100115.

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