Table 1.
Descriptive statistics of daily airborne pollutants and weather variables in 41 Chinese cities from January 20 to February 29, 2020
| Variables | Min | Q25 | Median | Q75 | Max | Mean | SD |
|---|---|---|---|---|---|---|---|
| PM2.5 (μg/m3) | 2.0 | 26.0 | 42.0 | 65.0 | 270.0 | 51.0 | 35.9 |
| PM10 (μg/m3) | 5.0 | 34.0 | 53.0 | 80.0 | 338.0 | 62.4 | 39.8 |
| NO2 (μg/m3) | 3.0 | 11.0 | 16.0 | 23.0 | 116.0 | 18.8 | 11.8 |
| SO2 (μg/m3) | 2.0 | 5.0 | 6.0 | 9.0 | 56.0 | 7.7 | 5.3 |
| CO (mg/m3) | 0.2 | 0.6 | 0.8 | 1.0 | 2.3 | 0.9 | 0.3 |
| O3 (μg/m3) | 5.0 | 58.0 | 76.0 | 94.0 | 150.0 | 75.9 | 23.4 |
| Temperature (°C) | −22.5 | 5.0 | 7.6 | 10.3 | 23.0 | 7.6 | 5.5 |
| Relative humidity (%) | 9.3 | 65.2 | 75.8 | 86.8 | 100 | 74.7 | 15.2 |