Distribution of the absolute differences between the daily levels of NO2 (“event days”) and the average concentrations over the two “control days” (for example, seven days before and after) using data from 1999 and 2000. All units are in μg/m3
| City | Mean | 10th | 25th | 50th | 75thh | 90th |
|---|---|---|---|---|---|---|
| (1) Distribution of daily concentrations of NO2 | ||||||
| Davos | 14.1 | 4.4 | 5.5 | 8.6 | 18.4 | 33.4 |
| Basle | 25.4 | 10.3 | 15.8 | 23.4 | 32.8 | 42.8 |
| Lugano | 38.3 | 20.0 | 25.5 | 35.4 | 48.6 | 60.0 |
| (2) Distribution of the absolute differences between daily concentrations of NO2 and the average concentrations of NO2 over the two control days (that is, ±7 days | ||||||
| Full two year data | ||||||
| Davos | 6.2 | 0.5 | 1.2 | 2.8 | 7.7 | 17.1 |
| Basle | 9.9 | 1.4 | 3.8 | 8.2 | 13.6 | 21.0 |
| Lugano | 10.2 | 1.3 | 3.4 | 7.1 | 13.1 | 25.0 |
| Summer months only (April to October) | ||||||
| Davos | 2.3 | 0.3 | 0.8 | 1.7 | 2.9 | 5.2 |
| Basle | 7.1 | 1.0 | 2.7 | 5.9 | 10.3 | 15.3 |
| Lugano | 6.8 | 0.9 | 2.6 | 5.4 | 9.0 | 14.2 |