Table 3.
Air pollution exposure during different time period.
| Pollutant and Weather Parameters | Days before Sample Collection (N=781, n=1991) |
||||
|---|---|---|---|---|---|
| 0–90 days |
0–9 days |
10–14 days |
70–90 days |
||
| Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | p value | |
| PM2.5 (μg/m3) | 39.13 (7.73) | 32.96 (17.25) | 34.57 (17.61) | 41.90 (9.84) | <0.001 |
| PM10 (μg/m3) | 66.84 (10.55) | 54.81 (24.77) | 58.00 (25.69) | 69.97 (13.91) | <0.001 |
| O3 (μg/m3) | 69.08 (19.09) | 70.44 (23.18) | 74.05 (25.98) | 58.02 (18.17) | <0.001 |
| NO2 (μg/m3) | 39.49 (7.06) | 34.72 (10.91) | 35.88 (12.47) | 41.16 (10.04) | <0.001 |
| CO (mg/m3) | 0.66 (0.09) | 0.69 (0.16) | 0.68 (0.17) | 0.68 (0.11) | <0.001 |
| SO2 (μg/m3) | 6.21 (1.85) | 5.53 (2.41) | 5.69 (2.74) | 6.51 (1.96) | <0.001 |
| Ground Temperature(°C) | 22.24 (5.00) | 25.03 (6.74) | 24.86 (6.71) | 18.54 (4.60) | <0.001 |
| Relative humidity(%) | 75.64 (5.33) | 79.55 (6.89) | 78.34 (7.61) | 75.97 (7.27) | <0.001 |
Abbreviations: N=number of unique individuals; n=number of samples; SD=standard deviation; PM2.5=particulate matter with aerodynamic diameter ≤2.5 μm; PM10=particulate matter with aerodynamic diameter ≤10 μm; O3=ozone; NO2=nitrogen dioxide; CO=carbon monoxide; SO2=sulfur dioxide.