Baseline average concentrations of traffic-related air pollutants, average levels of community noise and correlation coefficients*
| Pollutant | Mean (SD) (close to major roads)† | Mean (SD) (away from major roads)‡ | Mean (SD) | Median | IQR | Range | Correlation coefficient | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| BC | PM2.5 | NO2 | NO | Noise | |||||||
| BC (10–5/m)§ | 3.03 (1.60) | 1.24 (0.71) | 1.65 (1.24) | 1.08 | 0.89–1.90 | 0.0–5.00 | 1.00 | – | – | – | – |
| PM2.5 (μg/m3) | 4.27 (1.54) | 4.03 (1.42) | 4.08 (1.45) | 4.09 | 3.40–4.81 | 0.0–10.00 | 0.13 | 1.00 | – | – | – |
| NO2 (μg/m3) | 19.1 (4.2) | 16.6 (3.9) | 17.2 (4.1) | 16.5 | 14.6–18.7 | 7.9–30.0 | 0.38 | 0.45 | 1.00 | – | – |
| NO (μg/m3) | 39.0 (15.7) | 24.1 (6.7) | 27.6 (11.4) | 24.9 | 20.5–31.3 | 8.4–100.0 | 0.51 | 0.43 | 0.73 | 1.00 | – |
| Noise (dB(A)) | 73.9 (6.2) | 65.4 (5.3) | 67.4 (6.6) | 65.3 | 63.2–71.8 | 37.1–83.4 | 0.40 | 0.19 | 0.28 | 0.41 | 1.00 |
*The results are derived from all participants, unless otherwise specified.
†For participants living close to major roads.
‡For participants living away from major roads.
§10−5/m black carbon ≈0.8 μg/m3 elemental carbon.
BC, black carbon; PM2.5, particulate matter <2.5 μm in aerodynamic diameter.