Table 2.
Daily personal exposures to trace metals
| Exposure | N | Mean (SD) | Median | Interquartile Range | Minimum/Maximum | Minimum Detection Limit |
|---|---|---|---|---|---|---|
| Trace Metals (ng/m3) | ||||||
| Al | 211 | 61.4 (45.7) | 49.4 | 54.2 | 0.24/267 | 0.0049 |
| As | 86 | 1.01 (0.67) | 0.91 | 0.79 | 0.12/3.12 | 0.0003 |
| Ba | 172 | 10.3 (7.88) | 8.66 | 9.42 | 0.15/36.6 | 0.0015 |
| Cr | 186 | 3.45 (4.24) | 2.08 | 2.98 | 0.01/28.8 | 0.0003 |
| Cu | 210 | 11.9 (17.2) | 6.44 | 10.4 | 0.53/128 | 0.0003 |
| Fe | 215 | 68.3 (48.9) | 53.2 | 59.4 | 8.22/353 | 0.0003 |
| Mg | 182 | 14.6 (10.7) | 11.7 | 15.1 | 0.25/50.9 | 0.0015 |
| Mn | 207 | 2.68 (2.68) | 2.06 | 2.21 | 0.08/28.8 | 0.0003 |
| Ni | 176 | 1.03 (1.06) | 0.77 | 0.90 | 0.01/8.71 | 0.0002 |
| S | 217 | 271 (164) | 231 | 179 | 41.5/1151 | 0.0010 |
| Sb | 58 | 22.8 (15.3) | 19.0 | 23.4 | 2.23/68.4 | 0.0167 |
| Sr | 110 | 2.80 (3.04) | 1.68 | 3.22 | 0.04/13.0 | 0.0004 |
| V | 131 | 1.97 (1.49) | 1.61 | 2.18 | 0.06/6.32 | 0.0004 |
| Zn | 211 | 23.5 (27.2) | 15.5 | 18.2 | 1.08/238 | 0.0009 |
| Ambient temperature (°C) | 215 | 21.1 (1.53) | 21.0 | 2.00 | 16.0/26.0 | |
| Relative humidity | 215 | 46.7 (13.0) | 43.9 | 22.1 | 21.0/68.4 | |
The minimum detection limit (ng/m3) for the measurements was calculated using a flow rate of 4 LPM for 24 h filter samples