| Value | Category | Cases | |
|---|---|---|---|
| 1 | Industrial activities | 14 |
0.4%
|
| 2 | Burning waste | 104 |
3.3%
|
| 3 | Transport | 32 |
1%
|
| 4 | Construction work | 11 |
0.4%
|
| 5 | Other / specify | 9 |
0.3%
|
| 6 | Smoke from neighbors | 15 |
0.5%
|
| 7 | Electrical generator | 3 |
0.1%
|
| Sysmiss | 2934 |