Table 2.
Description of environmental factors in Chengdu from 2014 to 2020
| Variables | Mean ± SD | Min | P25 | Median | P75 | Max |
|---|---|---|---|---|---|---|
| temperature (°C) | 18.14 ± 7.28 | 1.39 | 11.39 | 18.89 | 24.44 | 32.33 |
| Wind speed (m/s) | 3.74 ± 1.58 | 0.98 | 3.00 | 3.00 | 4.16 | 15.02 |
| Relative humidity (%) | 75.45 ± 11.35 | 28.11 | 67.80 | 75.95 | 84.15 | 99.87 |
| Precipitation (mm) | 2.89 ± 10.59 | 0 | 0 | 0 | 1.02 | 188.47 |
| PM2.5(ug/m3) | 60.27 ± 40.52 | 3.60 | 35.50 | 48.09 | 72.93 | 371.21 |
| PM10(ug/m3) | 91.92 ± 63.08 | 8.64 | 47.52 | 75.20 | 117.63 | 555.45 |
| O3(ug/m3) | 74.10 ± 39.30 | 1.86 | 42.55 | 68.50 | 111.12 | 178.48 |
| NO2(ug/m3) | 51.47 ± 20.75 | 2.07 | 37.12 | 49.28 | 64.44 | 126.49 |
| SO2(ug/m3) | 10.88 ± 9.18 | 0 | 5.46 | 7.71 | 13.56 | 76.42 |
| C0(mg/m3) | 0.89 ± 0.42 | 0 | 0.61 | 0.81 | 1.07 | 2.90 |
Note: SD represent standard deviation, Px represent percentile of the data