Table 2.
Pearson correlation coefficients between air pollutants and meteorological factors across all the cities and provinces
| PM2.5, μg/m3 | PM10, μg/m3 | O3, ppm | NO2, ppm | CO, ppm | SO2, ppm | Temperature, °C | Wind speed, m/s | Humidity (%) | Air pressure, hPa | |
|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5, μg/m3 | … | |||||||||
| PM10, μg/m3 | 0.71 (<0.001) | … | ||||||||
| O3, ppm | −0.18 (<0.001) | 0.16 (<0.001) | … | |||||||
| NO2, ppm | 0.51 (<0.001) | 0.26 (<0.001) | −0.56 (<0.001) | … | ||||||
| CO, ppm | 0.65 (<0.001) | 0.31 (<0.001) | −0.49 (<0.001) | 0.63 (<0.001) | … | |||||
| SO2, ppm | 0.29 (<0.001) | 0.23 (<0.001) | −0.18 (<0.001) | 0.36 (<0.001) | 0.45 (<0.001) | … | ||||
| Temperature, °C | 0.11 (<0.001) | −0.05 (0.05) | −0.34 (<0.001) | 0.26 (<0.001) | 0.25 (<0.001) | 0.07 (0.004) | … | |||
| Wind speed, m/s | −0.06 (0.03) | −0.01 (0.82) | 0.02 (0.46) | 0.07 (0.01) | 0.04 (0.11) | −0.04 (0.16) | 0.03 (0.26) | … | ||
| Humidity (%) | −0.15 (<0.001) | −0.04 (0.05) | 0.18 (<0.001) | −0.14 (<0.001) | −0.17 (<0.001) | −0.06 (0.02) | 0.12 (<0.001) | −0.18 (<0.001) | … | |
| Air pressure, hPa | −0.08 (0.002) | −0.06 (0.02) | 0.20 (<0.001) | −0.04 (0.15) | −0.15 (<0.001) | −0.14 (<0.001) | −0.35 (<0.001) | −0.01 (0.76) | −0.10 (<0.001) | … |