| Value | Category | Cases | |
|---|---|---|---|
| 1 | Traffic | 464 |
14.4%
|
| 2 | Airplanes | 3 |
0.1%
|
| 3 | Quarries/Stone cutting | 12 |
0.4%
|
| 4 | Construction activities | 39 |
1.2%
|
| 5 | Industrial activities | 41 |
1.3%
|
| 6 | Other, specify | 60 |
1.9%
|
| Sysmiss | 2601 |