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5, PM10, SO2, CO, and NO2 were positively correlated with hospital visits for depression. The strongest effects all occurred on lag0 (the same) day, and the corresponding excess risks (ERs) were 2.59 (95%CI 0.72, 4.49) for PM2.5, 3.08 (95%CI 1.05, 5.16) for PM10, 3.22 (95%CI 1.16, 5.32) for SO2, 4.38 (95%CI 1.83, 6.99) for CO, and 4.94 (95%CI 2.03, 7.92) for NO2 per IQR increase, respectively. The associations were found to be stronger in the elderly (≥65 years) and cold season. Furthermore, the effects of CO and NO2 remained significant in most two-polluta