Table 2.
Summary statistics of meteorological factors and air pollutants during the study period in Kaohsiung.
| Percentiles | Mean | Pre-COVID-19 (Mean ± SD) | During COVID-19 (Mean ± SD) | p | IQR | |||
|---|---|---|---|---|---|---|---|---|
| 25% | 50% | 75% | ||||||
| PM2.5 (µg/m3) | 17.4 | 27.5 | 36.1 | 27.4 | 30.2 ± 13.0 | 20.4 ± 11.0 | <0.001 | 18.7 |
| PM10 (µg/m3) | 39.7 | 55.3 | 71.0 | 55.8 | 61.8 ± 22.7 | 40.8 ± 18.5 | <0.001 | 31.3 |
| NO2 (ppb) | 11.5 | 15.4 | 19.7 | 15.8 | 16.8 ± 5.3 | 13.3 ± 5.0 | <0.001 | 8.2 |
| O3 (ppb) | 22.9 | 31.3 | 39.3 | 31.6 | 29.8 ± 11.5 | 31.8 ± 11.0 | 0.268 | 16.4 |
| Temperature (°C) | 21.3 | 24.2 | 27.3 | 24.1 | 23.9 ± 3.8 | 24.7 ± 4.1 | 0.011 | 6.0 |
| Humidity (%) | 69.3 | 72.7 | 75.9 | 72.4 | 72.5 ± 6.5 | 72.3 ± 6.5 | 0.844 | 6.6 |
SD, standard deviation; IQR, interquartile range.