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. 2019 Jan 23;14:297–309. doi: 10.2147/COPD.S188900

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© 2019 Gao et al. This work is published and licensed by Dove Medical Press Limited

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Percentage changes with 95% CIs in COPD hospitalization visits with per 10 µg/m³ increase in PM_2.5 (A), PM₁₀ (B), NO₂ (C), SO₂ (D), CO (E), and O₃ (F) levels by single-day lag model.

Notes: For CO, percentage change in the relative risks corresponded to each 1 mg/m³ increment of CO levels. *P<0.05; **P<0.01.

Abbreviations: CO, carbon monoxide; NO₂, nitrogen dioxide; O₃, ozone; PM_2.5, particulate matter ≤2.5 µm in aerodynamic diameter; PM₁₀, particulate matter ≤10 µm in aerodynamic diameter; SO₂, sulfur dioxide.