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Pearson correlation coefficients between key exposure variables
| Noise (dB) | Freeway NOx (ppb) | Non-Freeway NOx (ppb) | Distance to Freeway (km) | |
|---|---|---|---|---|
| Noise (dB) | 1.00 | 0.53 | 0.33 | −0.57 |
| Freeway NOx (ppb) | 1.00 | 0.38 | −0.52 | |
| Non-Freeway NOx (ppb) | 1.00 | −0.19 | ||
| Distance to Freeway (km) | 1.00 |
