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Average 1 min Ig for each month under given conditions of PM2.5 pollution in Hong Kong. The inset bar charts show the daily total Ig, where CB, C1, C2, C3, and C4 refer to the baseline condition, 0–12.0, 12.0–35.4, 35.5–55.4, and 55.5–150.4 μg/m3 of PM2.5 concentration, respectively.
