Evolving relationships between air pollution attenuation and AECOPD hospitalizations during a stringent control period in Shijiazhuang, China, 2017-2024.

Front Public Health · 2026 · PMC12929520 · PMID 41743482

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an increasing trendno p-value reported

Notably, as concentrations of particulate matter and other gaseous pollutants declined, O3 levels demonstrated an increasing trend—a phenomenon widely reported in other studies ( 26 – 28 ).

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