| Value | Category | Cases | |
|---|---|---|---|
| 1 | Industrial activities | 29 |
0.9%
|
| 2 | Burning waste | 163 |
5.1%
|
| 3 | Transportation | 62 |
1.9%
|
| 4 | Construction activities | 14 |
0.4%
|
| 5 | Other, specify | 25 |
0.8%
|
| Sysmiss | 2927 |