Table 3.
Spearman correlation of the untransformed exposures within the Munich study area (lower triangle) and Wesel study area (upper triangle).
| Exposure | NDVI (500 m) (NDVI units) | NDVI (1,000 m) (NDVI units) | NO2 (μg/m3) | PM10 (μg/m3) | PM2.5 (μg/m3) | PM2.5 absorbance (10–5/m) |
|---|---|---|---|---|---|---|
| NDVI (500 m) (NDVI units) | 1 | 0.86 | –0.58 | –0.71 | –0.54 | –0.6 |
| NDVI (1,000 m) (NDVI units) | 0.91 | 1 | –0.65 | –0.82 | –0.64 | –0.72 |
| NO2 (μg/m3) | –0.40 | –0.45 | 1 | 0.75 | 0.71 | 0.76 |
| PM10 (μg/m3) | –0.32 | –0.30 | 0.57 | 1 | 0.76 | 0.90 |
| PM2.5 (μg/m3) | –0.15 | –0.07 | 0.17 | 0.36 | 1 | 0.71 |
| PM2.5 absorbance (10–5/m) | –0.07 | –0.06 | 0.42 | 0.66 | 0.38 | 1 |
| All correlations were statistically significant (p < 0.05) except between PM2.5 absorbance and NDVI (500 m and 1,000 m) in Munich and between PM2.5 and NDVI (1,000 m) in Munich. | ||||||