| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, go to the next pollutant | 2343 |
60.8%
|
| 2 | Seldom, go to the next pollutant | 268 |
7%
|
| 3 | Some times | 999 |
25.9%
|
| 4 | Very often | 244 |
6.3%
|