Table 2.
Descriptive statistics of air pollutants and meteorological factors in Guangzhou, 2012–2015
| Data | Mean | SD | Min | P25 | Median | P75 | Max |
|---|---|---|---|---|---|---|---|
| Air pollutants concentrations | |||||||
| SO2 (μg/m3) | 18.0 | 9.3 | 1.5 | 11.5 | 16.3 | 23.0 | 55.5 |
| NO2 (μg/m3) | 55.6 | 22.5 | 10.3 | 39.0 | 51.0 | 67.8 | 169.0 |
| O3 (μg/m3) | 79.9 | 53.2 | 2.5 | 37.3 | 70.8 | 110.3 | 296.5 |
| PM10 (μg/m3) | 65.9 | 32.5 | 5.0 | 41.0 | 59.5 | 83.5 | 244.8 |
| PM2.5 (μg/m3) | 47.5 | 25.6 | 6.8 | 28.0 | 42.5 | 60.5 | 193 |
| Meteorologic measures | |||||||
| Temperature (°C) | 23.2 | 6.4 | 5.5 | 18.2 | 24.9 | 28.3 | 33.5 |
| Relative humidity (%) | 78.0 | 11.1 | 31.0 | 72.0 | 79.0 | 86.0 | 100.0 |