Table 2.
Spearman correlation coefficient between air pollutants and COVID-19 case numbers.
| Climatic variables | Correlation coefficient | p-value |
|---|---|---|
| PM2.5 | 0.34 | 0.0032 |
| PM10 | −0.21 | 0.072 |
| O3 | −0.33 | 0.0043 |
| NO2 | 0.54 | <0.001 |
| CO | −0.12 | 0.31 |
| SO2 | −0.12 | 0.32 |
| PSI | 0.35 | 0.0020 |
| Temperature | 0.45 | <0.001 |
| Rainfall | −0.23 | 0.049 |
| Humidity | −0.032 | 0.79 |
Abbreviations: NO2: nitrogen dioxide, SO2: sulphur dioxide, CO: carbon monoxide, O3: ozone, PSI: pollutant standards index, PM2.5: particulate matter with a diameter of 2.5 μm or less, PM10: particulate matter with a diameter of 10 μm or less.