Table 2.
Levels of personal exposure to PM2.5 and Elemental Carbon (EC) during work hours, and of ambient PM10 and outdoor temperature on the days before examination
| Time window | Office Workers | Truck Drivers | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| N | Mean | SD | 10pct | 25pct | Median | 75pct | 90pct | N | Mean | SD | 10pct | 25pct | Median | 75pct | 90pct | p-value | ||
| Personal PM2.5a (μg/m3) on the examination days, from personal monitors | ||||||||||||||||||
| 8 hours | 120 | 94.6 | 64.9 | 22.4 | 48.5 | 86.2 | 126.6 | 183.4 | 119 | 126.8 | 68.8 | 46.3 | 73.9 | 116.8 | 160.5 | 213.9 | <0.001 | |
| Personal ECa (μg/m3) on the examination days, from personal monitors | ||||||||||||||||||
| 8 hours | 118 | 13.0 | 4.0 | 7.1 | 10.0 | 13.2 | 15.8 | 18.4 | 120 | 17.2 | 6.6 | 9.2 | 12.9 | 16.7 | 20.9 | 26.1 | <0.001 | |
| Ambient PM10 (μg/m3) from ambient monitors on the days prior to the study days | ||||||||||||||||||
| 1-day mean | 120 | 121.5 | 47.8 | 72.0 | 82.0 | 118.0 | 146.0 | 186.0 | 120 | 119.5 | 51.2 | 64.0 | 82.0 | 118.0 | 142.0 | 188.0 | 0.76 | |
| 2-day mean | 120 | 121.6 | 38.0 | 74.5 | 93.0 | 125.0 | 146.0 | 173.0 | 120 | 119.3 | 40.3 | 66.0 | 91.0 | 120.0 | 144.0 | 157.0 | 0.64 | |
| 5-day mean | 120 | 119.5 | 26.9 | 80.7 | 105.6 | 119.6 | 138.0 | 148.8 | 120 | 118.2 | 25.6 | 81.0 | 96.8 | 119.6 | 136.8 | 144.0 | 0.69 | |
| 8-day mean | 120 | 119.5 | 23.0 | 84.9 | 101.8 | 119.9 | 141.5 | 146.5 | 120 | 120.2 | 21.5 | 95.6 | 102.8 | 120.4 | 139.0 | 146.3 | 0.81 | |
| Outdoor temperature (°C) on the days prior to the study days | ||||||||||||||||||
| 1-day mean | 120 | 25.1 | 2.7 | 22.0 | 23.0 | 26.0 | 28.0 | 29.0 | 120 | 25.3 | 2.6 | 22.0 | 23.0 | 26.0 | 28.0 | 29.0 | 0.75 | |
| 2-day mean | 120 | 25.2 | 2.3 | 22.0 | 23.0 | 25.5 | 27.5 | 28.0 | 120 | 25.0 | 2.7 | 22.0 | 23.0 | 25.3 | 27.0 | 28.0 | 0.56 | |
| 5-day mean | 120 | 25.1 | 1.8 | 22.6 | 23.6 | 25.6 | 26.4 | 27.2 | 120 | 24.9 | 1.7 | 22.6 | 23.2 | 25.4 | 26.4 | 27.0 | 0.30 | |
| 8-day mean | 120 | 25.0 | 1.4 | 23.1 | 24.0 | 24.6 | 26.4 | 27.0 | 120 | 24.9 | 1.4 | 23.1 | 23.6 | 24.5 | 26.3 | 26.9 | 0.34 | |
aMeasured during the work hours of examination days using light-weight personal monitors.