Table 2.
Distribution of the daily mean meteorological data and air pollutant concentrations in Beijing, China, 2013–2015.
| Daily Data | Mean | SD | Min | P (25) | Median | P (75) | Max |
|---|---|---|---|---|---|---|---|
| Meteorological | |||||||
| Temperature, °C | 13.2 | 11.1 | −10.0 | 4.0 | 12.5 | 23.5 | 31.0 |
| Relative humidity, % | 68.2 | 16.8 | 39 | 55 | 68 | 71 | 86 |
| Air pollutants | |||||||
| PM2.5, μg/m3 | 76.0 | 65.8 | 5.0 | 29.0 | 58.0 | 104.0 | 476.0 |
| PM2.5–10, μg/m3 | 96.4 | 72.9 | 18.2 | 45.0 | 87.2 | 133.5 | 481.2 |
| O3, μg/m3 | 61.8 | 22.1 | 12.1 | 24.2 | 50.1 | 80.0 | 169.5 |
| NO2, μg/m3 | 51.7 | 7.8 | 6.2 | 31.3 | 43.4 | 61.1 | 136.2 |
| CO, mg/m3 | 1.20 | 0.28 | 0.22 | 0.61 | 0.94 | 1.47 | 8.11 |
| SO2, μg/m3 | 14.4 | 4.3 | 2.2 | 3.1 | 7.1 | 18.3 | 133.1 |