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<p>While interprovincial border regions serve as crucial ecological transition zones, their seasonal transmission pathways and implications for compound pollution have been inadequately characterized. This study examines the Jiangsu-Anhui-Shandong-Henan border region (2015–2024) using an integrated trajectory-source apportionment framework. Seasonal shifts in transport pathways are found to modulate observed pollution patterns. In winter, the prevalence of northwestern trajectories is associated with PM<sub>2.5</sub> accumulation and the suppression of O₃ formation; in summer, PM<sub>2.5</sub> and O₃ exhibit a significant positive co-variation (correlation coefficient COR &gt; 0.5), with their concentration trends showing a clear synchronization with the trajectory of the southeast monsoon and the photochemical oxidation process under high-temperature conditions. Additionally, pollutant spatial heterogeneity reflects nonlinear factor interactions—specifically industrial-meteorological coupling (SO₂–temperature, q = 0.813) and vegetation-moisture feedbacks (NDVI–greening, q = 0.799). Based on these findings, seasonally adjusted cross-border strategies are recommended, with strengthened winter controls on primary emissions from northwestern transport and integrated summer management of southeastern precursors and local meteorology.</p>

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The Spatiotemporal Evolution Characteristics and Multi-Scale Interactions of Atmospheric Pollution in the Transitional Zones of Urban Agglomerations in China

  • 期刊论文

  • 发表日期：

    2026年6月24日

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  • Pei Shao,
  • Jiazheng Li,
  • Hengbing Zhou,
  • Ruoxi Wang,
  • Zhen He,
  • Danfeng Ye,
  • Fangtao Wu

摘要

While interprovincial border regions serve as crucial ecological transition zones, their seasonal transmission pathways and implications for compound pollution have been inadequately characterized. This study examines the Jiangsu-Anhui-Shandong-Henan border region (2015–2024) using an integrated trajectory-source apportionment framework. Seasonal shifts in transport pathways are found to modulate observed pollution patterns. In winter, the prevalence of northwestern trajectories is associated with PM2.5 accumulation and the suppression of O₃ formation; in summer, PM2.5 and O₃ exhibit a significant positive co-variation (correlation coefficient COR > 0.5), with their concentration trends showing a clear synchronization with the trajectory of the southeast monsoon and the photochemical oxidation process under high-temperature conditions. Additionally, pollutant spatial heterogeneity reflects nonlinear factor interactions—specifically industrial-meteorological coupling (SO₂–temperature, q = 0.813) and vegetation-moisture feedbacks (NDVI–greening, q = 0.799). Based on these findings, seasonally adjusted cross-border strategies are recommended, with strengthened winter controls on primary emissions from northwestern transport and integrated summer management of southeastern precursors and local meteorology.