Table 2.
Daily averages of exposure in the two study centers during the study waves (mean ± standard deviation)
| Wave | Gothenburg | Umeå | |
|---|---|---|---|
| NOx (µg/m3) | 1 (Pollen season) | 25.6 ± 14.7 | 9.2 ± 5.0 |
| 2 (Control season) | 28.9 ± 18.3 | 37.5 ± 30.7 | |
| 3 (Pollen season) | 28.7 ± 19.0 | 14.6 ± 6.6 | |
| O3 (µg/m3) | 1 (Pollen season) | 66.0 ± 12.3 | 63.5 ± 7.7 |
| 2 (Control season) | 52.0 ± 15.7 | 40.0 ± 19.4 | |
| 3 (Pollen season) | 53.9 ± 13.8 | 86.8 ± 29.0 | |
| PM2.5 (µg/m3) | 1 (Pollen season) | 9.0 ± 6.3 | 3.7 ± 2.7* |
| 2 (Control season) | 6.9 ± 4.3 | 2.1 ± 1.3 | |
| 3 (Pollen season) | 7.1 ± 3.9 | 4.6 ± 2.6 | |
| Pollen (grains per m3) | 1 (Pollen season) | 180 ± 254 | 43 ± 49 |
| 2 (Control season) | - | - | |
| 3 (Pollen season) | 176 ± 221 | 231 ± 270 | |
| Temperature (°C) | 1 (Pollen season) | 9.1 ± 1.9 | 1.0 ± 4.2 |
| 2 (Control season) | 7.5 ± 3.5 | 10.0 ± 3.6 | |
| 3 (Pollen season) | 10.8 ± 4.4 | 5.9 ± 5.0 | |
| Relative humidity (%) | 1 (Pollen season) | 72.5 ± 11.0 | 75.1 ± 11.2 |
| 2 (Control season) | 85.5 ± 6.9 | 95.1 ± 6.8 | |
| 3 (Pollen season) | 64.7 ± 12.9 | 68.9 ± 12.6 |