Table 1.
Pollutant concentrations in the exposure airstream.
| Exposure/pollutant | n | Mean ± SD |
|---|---|---|
| Study of coarse and fine CAPs | ||
| Filtered ambient air | ||
| PM (μg/m3) | 29 | –0.4 ± 13.5 |
| Endotoxin [ln(ng/m3)] | 29 | 0.5 ± 0.3 |
| β-Glucan [ln(pg/m3)] | 29 | 7.1 ± 1.9 |
| SO2 (ppb) | 28 | 1.5 ± 1.7 |
| O3 (ppb) | 29 | 12.6 ± 7.3** |
| NO2 (ppb) | 26 | 20.8 ± 12.2** |
| CO (ppm) | 29 | 0.3 ± 0.1** |
| Filtered medical air | ||
| PM (μg/m3) | 41 | 2.0 ± 8.8 |
| Endotoxin [ln(ng/m3)] | ND | ND |
| β-Glucan [ln(pg/m3)] | ND | ND |
| SO2 (ppb) | 41 | 1.1 ± 1.0 |
| O3 (ppb) | 41 | 1.0 ± 2.1 |
| NO2 (ppb) | 41 | 1.2 ± 4.6 |
| CO (ppm) | 40 | 0.5 ± 0.2 |
| Coarse CAP | ||
| PM (μg/m3) | 76 | 212.9 ± 52.0 |
| Endotoxin [ln(ng/m3)] | 74 | 2.0 ± 1.1* |
| β-Glucan [ln(pg/m3)] | 61 | 10.5 ± 2.3* |
| SO2 (ppb) | 75 | 2.5 ± 2.8** |
| O3 (ppb) | 76 | 13.2 ± 7.2** |
| NO2 (ppb) | 68 | 19.5 ± 9.6** |
| CO (ppm) | 75 | 0.3 ± 0.1** |
| Fine CAP | ||
| PM (μg/m3) | 29 | 238.4 ± 62.0 |
| Endotoxin [ln(ng/m3)] | 28 | 2.0 ± 0.6* |
| β-Glucan [ln(pg/m3)] | 25 | 9.3 ± 1.1* |
| SO2 (ppb) | 28 | 1.5 ± 1.2 |
| O3 (ppb) | 29 | 11.2 ± 6.7** |
| NO2 (ppb) | 26 | 17.4 ± 8.6** |
| CO (ppm) | 28 | 0.3 ± 0.1** |
| Study of ultrafine CAP | ||
| Filtered medical air | ||
| PM (μg/m3) | 25 | 8.8 ± 21.1 |
| Particle number (count/cm3) | 25 | 16,405 ± 53,152 |
| Endotoxin [ln(ng/m3)] | ND | ND |
| β-Glucan [ln(pg/m3)] | ND | ND |
| SO2 (ppb) | 25 | 1.6 ± 1.2 |
| O3 (ppb) | 25 | 1.0 ± 1.6 |
| NO2 (ppb) | 25 | 3.5 ± 6.8 |
| CO (ppm) | 25 | 0.5 ± 0.2 |
| Ultrafine CAP | ||
| PM (μg/m3) | 25 | 135.8 ± 67.2** |
| Particle number (count/cm3) | 25 | 227,767 ± 63,902** |
| Endotoxin [ln(ng/m3)] | 6 | 0.12 ± 0.01 |
| β-Glucan [ln(pg/m3)] | 6 | 9.0 ± 1.3 |
| SO2 (ppb) | 25 | 2.5 ± 1.5** |
| O3 (ppb) | 25 | 5.1 ± 6.2** |
| NO2 (ppb) | 25 | 12.1 ± 8.4** |
| CO (ppm) | 25 | 0.3 ± 0.2** |
| ND, not detectable. *Significantly different from filtered ambient air, p < 0.05. **Significantly different from filtered medical air, p < 0.05. | ||