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. 2021 Mar 18;19(1):781–791. doi: 10.1007/s40201-021-00645-6

Table 1.

The mean, min and max of hourly concentrations of PM2.5, CO, SO2 and O3

Pollutant Min Max Mean St. Deviation No. of station
PM2.5 (μg/m3) 2.03 606 30.17 25.02 16
CO (mg/m3) 0.71 20.25 2.24 1.76 14
SO2 (μg/m3) 1.51 383.17 24.46 30.68 12
O3 (μg/m3) 3.86 110.12 42.2 27.86 2