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Correlation matrix of the exposures.
| PM2.5 (μg/m3) | BC (μg/m3) | NO2 (ppb) | PBL (m) | Temperature (°C) | Wind speed (knots) | |
|---|---|---|---|---|---|---|
| PM2.5 (μg/m3) | 1 | |||||
| BC (μg/m3) | 0.65 | 1 | ||||
| NO2 (ppb) | 0.45 | 0.57 | 1 | |||
| PBL (m) | –0.35 | –0.52 | –0.35 | 1 | ||
| Temperature (°C) | 0.30 | 0.26 | –0.25 | –0.23 | 1 | |
| Wind speed (knots) | –0.28 | –0.52 | –0.37 | 0.54 | –0.28 | 1 |
