| Value | Category | Cases | |
|---|---|---|---|
| 1 | Traffic | 15 |
0.6%
|
| 2 | Planes | 6 |
0.2%
|
| 3 | Queries and stone cutting | 4 |
0.2%
|
| 4 | Construction | 26 |
1%
|
| 5 | Industrial activities | 20 |
0.8%
|
| 6 | Others | 16 |
0.6%
|
| Sysmiss | 2525 |