Table 1.
Distributions of air pollutants and meteorological factors at lag 0 day during the study period
| Variable | Mean | SD | Minimum | P25 | Median | P75 | Maximum |
|---|---|---|---|---|---|---|---|
| PM2.5 (μg/m3) | 38.6 | 25.5 | 7.0 | 20.0 | 32.0 | 50.0 | 135.0 |
| Organic matter (μg/m3) | 9.3 | 6.1 | 1.6 | 4.8 | 7.7 | 11.9 | 33.1 |
| Black carbon (μg/m3) | 1.8 | 1.1 | 0.3 | 1.0 | 1.5 | 2.3 | 6.1 |
| Nitrate (μg/m3) | 8.1 | 7.0 | 0.8 | 2.9 | 5.9 | 11.1 | 34.9 |
| Sulfate (μg/m3) | 6.7 | 4.3 | 1.2 | 3.5 | 5.6 | 8.7 | 23.1 |
| Ammonium (μg/m3) | 5.3 | 4.3 | 0.6 | 2.1 | 4.0 | 7.2 | 21.6 |
| Temperature (°C) | 15.0 | 10.6 | −22.4 | 7.6 | 16.7 | 23.8 | 32.8 |
| Humidity (%) | 63.2 | 19.6 | 3.5 | 48.8 | 66.7 | 79.2 | 99.9 |
SD standard deviation, P25 the 25th percentile, P75 the 75th percentile, PM2.5 fine particulate matter.