Table 4 Comparison of the exposure conditions between the present study and previous studies by Barregård and Sällsten
From: Antioxidant airway responses following experimental exposure to wood smoke in man
Parameter | Unit | Present study | |
|---|---|---|---|
Temperature in chamber | °C | 21-24 | 23 |
Relative humidity in chamber | % | 20-50 | 35 |
Exchange rate of air in chamber | times/hour | ~10 | ~2 |
NOx (approximately 90% as NO) | ppm | 0.2-0.4 | 0.6 and 0.7 |
CO | ppm | 5-15 | 13 and 9.1 |
1.3-Butadiene | μg/m3 | 11.0 ± 2.8 | ~6 and ~4 |
Benzene | μg/m3 | 81.8 ± 14.3 | ~30 and ~20 |
PM2.5 mass concentration (filter) | μg/m3 |  | 242 ± 8.2 and 272 ± 2 |
PM2.5 mass concentration (TEOM) | μg/m3 | 224 ± 22 | ~130-230 |
Mass median diameter (MMDa) | μm | 0.218 and 228* |  |
Particle number concentrations | #/cm3 | 6.7 ± 0.9×104 | 18.0×104 and 9.5×104 |
Geometric mean diameter (GMD) | μm | 0.120 ± 0.018** | 0.042 and 0.112*** |
Geometric standard deviation (σg) |  | 1.81 ± 0.06 | 1.7 and 1.4 |
Organic carbon (OC × 1.4) fraction | % (of PMtot) | ~60 |  |
Elemental carbon (EC) fraction | % (of PMtot) | ~25 | Â |
Black smoke (BS) fraction | % (of PMtot) | Â | ~30 and ~40 |
Total PAH concentration | μg/m3 | 0.76 ± 0.17**** |  |
|  |  | 0.68 ± 0.15***** | 0.44 and 0.47***** |
Semi-volatile PAH fraction | % | 74-88 | Â |
PM-associated PAH fraction | % | 12-26 | Â |
Inorganic major ions (alkali salts) | % (of PMtot) | ~13 | ~4-5 |
Trace metals | % (of PMtot) | ~2 | ~2 |