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The exposure-response relationships between air pollutants and depressive symptoms. a, PM2.5. b, PM10. c, NO2. d, CO. e, SO2. f, O3. The red vertical dotted line reflects the air quality thresholds set by Chinese national standards, with matching amounts set at 60 μg m−3 for SO2, 40 μg m−3 for NO2, 70 μg m−3 for PM10, and 35 μg m−3 for PM2.5. OR, odds ratio; CI, confidence interval.
