Table 3.
Descriptive statistics of daily air pollutant measurements.
| Exposure (24-hr averages) | No. (missing) | Mean ± SD | Median | IQR | Min–Max |
|---|---|---|---|---|---|
| Outdoor hourly PM | |||||
| EC (μg/m3) | 166 (14) | 1.61 ± 0.62 | 1.56 | 0.92 | 0.24–3.94 |
| OC (μg/m3) | 166 (14) | 5.94 ± 2.11 | 5.58 | 2.79 | 2.51–13.60 |
| BC (μg/m3) | 179 (1) | 2.00 ± 0.77 | 1.89 | 0.96 | 0.58–5.11 |
| OCpri (μg/m3) | 166 (14) | 3.37 ± 1.21 | 3.21 | 1.63 | 0.99–7.11 |
| Secondary OC (μg/m3) | 166 (14) | 2.49 ± 1.50 | 2.10 | 1.86 | 0–8.10 |
| PN (particles/cm3) | 152 (28) | 16,043 ± 5,886 | 13,968 | 7,386 | 6,837–31,263 |
| Outdoor hourly gases | |||||
| NO2 (ppb) | 178 (2) | 33.10 ± 9.64 | 32.22 | 13.87 | 11.22–59.83 |
| CO (ppm) | 169 (11) | 0.71 ± 0.29 | 0.70 | 0.41 | 0.14–1.68 |
| O3 (ppb) | 176 (4) | 33.22 ± 11.68 | 32.19 | 15.69 | 8.50–70.88 |
| Indoor hourly PM | |||||
| EC (μg/m3) | 148 (32) | 1.31 ± 0.52 | 1.30 | 0.70 | 0.19–2.89 |
| EC of outdoor origin (μg/m3) | 158 (22) | 1.11 ± 0.39 | 1.06 | 0.51 | 0.41–2.97 |
| OC (μg/m3) | 148 (32) | 5.69 ± 1.51 | 5.60 | 1.96 | 2.34–10.79 |
| OCpri of outdoor origin (μg/m3) | 166 (14) | 2.18 ± 0.82 | 2.15 | 1.07 | 0.32–5.21 |
| Secondary OC of outdoor origin (μg/m3) | 166 (14) | 2.08 ± 1.26 | 1.75 | 1.45 | 0–6.87 |
| PN (particles/cm3) | 144 (36) | 14,494 ± 6,770 | 12,341 | 7,337 | 1,016–43,027 |
| PN of outdoor origin (particles/cm3) | 124 (56) | 10,108 ± 3,108 | 9,580 | 3,684 | 1,016–17,700 |
| Indoor hourly gases | |||||
| NO2 (ppb) | 170 (10) | 32.3 ± 8.5 | 32.0 | 11.0 | 12.5–53.5 |
| CO (ppb) | 174 (6) | 0.78 ± 0.30 | 0.73 | 0.42 | 0.22–1.97 |
| Outdoor PM mass | |||||
| PM0.25 (μg/m3) | 106 (14) | 9.47 ± 2.97 | 9.4 | 4.2 | 3.31–18.75 |
| PM0.25–2.5 (μg/m3) | 115 (5) | 13.53 ± 10.67 | 11.7 | 11.5 | 1.29–66.77 |
| PM2.5–10 (μg/m3) | 106 (14) | 10.04 ± 4.07 | 9.9 | 5.9 | 1.76–22.38 |
| Indoor PM mass | |||||
| PM0.25 (μg/m3) | 104 (16) | 10.45 ± 6.77 | 9.5 | 4.5 | 1.42–69.86 |
| PM0.25–2.5 (μg/m3) | 107 (13) | 7.36 ± 4.57 | 6.5 | 5.7 | 0.77–30.86 |
| PM2.5–10 (μg/m3) | 111 (9) | 4.12 ± 4.76 | 2.8 | 3.5 | 0.12–37.63 |
Abbreviations: IQR, interquartile range; Max, maximum; Min, minimum.