| Value | Category | Cases | |
|---|---|---|---|
| 1 | Industrial activities | 20 |
0.8%
|
| 2 | Waste burning | 216 |
8.3%
|
| 3 | Transportation | 138 |
5.3%
|
| 4 | Construction | 13 |
0.5%
|
| 5 | Others | 117 |
4.5%
|
| Sysmiss | 2108 |