Spearman correlations between particulate air pollution, temperature, and relative humidity
| NC 0.1–1.0 | PM2.5 | NO2 | CO | Temperature °C | |
|---|---|---|---|---|---|
| All correlations >0.14 and <−0.13 statistically significant at p = 0.05 level. | |||||
| NC 0.01–0.1, 1/cm3 | |||||
| Amsterdam | 0.16 | −0.15 | 0.49 | 0.22 | −0.18 |
| Erfurt | 0.67 | 0.62 | 0.82 | 0.72 | −0.34 |
| Helsinki | 0.53 | 0.14 | 0.72 | 0.35 | −0.55 |
| NC 0.1–1, 1/cm3 | |||||
| Amsterdam | 0.80 | 0.67 | 0.60 | −0.10 | |
| Erfurt | 0.84 | 0.82 | 0.78 | −0.36 | |
| Helsinki | 0.80 | 0.72 | 0.51 | −0.17 | |
| PM2.5, μg/m3 | |||||
| Amsterdam | 0.49 | 0.58 | −0.14 | ||
| Erfurt | 0.82 | 0.77 | −0.44 | ||
| Helsinki | 0.35 | 0.40 | −0.07 | ||
| NO2, μg/m3 | |||||
| Amsterdam | 0.76 | −0.49 | |||
| Erfurt | 0.86 | −0.42 | |||
| Helsinki | 0.32 | −0.29 | |||
| CO, mg/m3 | |||||
| Amsterdam | −0.59 | ||||
| Erfurt | −0.62 | ||||
| Helsinki | −0.08 | ||||