| Value | Category | Cases | |
|---|---|---|---|
| 1 | Industrial activities | 33 |
0.9%
|
| 2 | Burning waste | 187 |
5.2%
|
| 3 | Transportation | 54 |
1.5%
|
| 4 | Construction activities | 8 |
0.2%
|
| 5 | Other, specify | 45 |
1.2%
|
| Sysmiss | 3280 |