Table 2.
Average concentrations of traffic-related air pollutants during the 5-year exposure period and Spearman correlation coefficients.
| Spearman correlation coefficient* |
||||||||
|---|---|---|---|---|---|---|---|---|
| Pollutant | Mean ± SD | Median | IQR | Range | BC | PM2.5 | NO2 | NO |
| BC (10−5/m) | 1.49 ± 1.10a | 1.02 | 0.94 | 0–4.98 | 1.00 | – | – | – |
| PM2.5 (μg/m3) | 4.08 ± 1.63 | 4.03 | 1.58 | 0–10.24 | 0.13 | 1.00 | – | – |
| NO2 (μg/m3) | 32.1 ± 8.0 | 30.6 | 8.4 | 15.3–57.7 | 0.39 | 0.47 | 1.00 | – |
| NO (μg/m3) | 32.0 ± 11.9 | 29.3 | 13.2 | 8.8–126.0 | 0.42 | 0.43 | 0.67 | 1.00 |
BC, black carbon.
a
Equivalent to approximately 1.19 ± 0.88 μg/m3 elemental carbon (10−5/m black carbon ≈ 0.8 μg/m3 elemental carbon).
*
p < 0.001 for each correlation coefficient.