Table 2 Distribution of daily average air pollutant concentration and meteorological factors during 2015–2018 in Changsha, China
Min | 25 percentile | Median | 75 percentile | Max | IQR | Mean | |
|---|---|---|---|---|---|---|---|
CO (mg/m3) | 0.41 | 0.71 | 0.85 | 1.04 | 2.17 | 0.33 | 0.90 |
SO2 (μg/m3) | 3.80 | 9.00 | 12.60 | 17.00 | 71.20 | 8.00 | 14.04 |
NO2 (μg/m3) | 9.90 | 23.20 | 31.30 | 44.70 | 107.00 | 21.50 | 35.56 |
O3 (μg/m3) | 7.70 | 54.55 | 84.55 | 117.50 | 228.20 | 62.95 | 88.51 |
PM2.5 (μg/m3) | 3.20 | 28.50 | 44.20 | 67.00 | 278.90 | 38.50 | 52.26 |
PM10 (μg/m3) | 5.40 | 46.22 | 66.50 | 96.40 | 411.30 | 50.18 | 75.40 |
Temperature (°C) | − 1.98 | 10.45 | 18.68 | 25.18 | 33.03 | 14.73 | 18.04 |
Relative humidity (%) | 40.25 | 72.00 | 82.00 | 91.50 | 99.25 | 19.50 | 80.61 |