| Value | Category | Cases | |
|---|---|---|---|
| 1 | Vehicle smoke | 422 |
3.4%
|
| 2 | Factory smoke | 73 |
0.6%
|
| 3 | Sewage odor | 742 |
6%
|
| 4 | Garbage container odors | 588 |
4.7%
|
| 5 | Other | 305 |
2.4%
|
| 6 | Non | 10333 |
82.9%
|