| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, go to the next pollutant | 2692 |
69.8%
|
| 2 | Seldom, go to the next pollutant | 294 |
7.6%
|
| 3 | Some times | 705 |
18.3%
|
| 4 | Very often | 163 |
4.2%
|