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| Pollution indicator | Threshold test | F-test | P-value | Test results | Threshold point of Index |
|---|---|---|---|---|---|
| SO2 | Single threshold | 13.44* | 0.0860 | Single threshold | 202 |
| Double threshold | 11.91 | 0.1620 | |||
| COD | Single threshold | 12.73* | 0.0900 | Single threshold | 239 |
| Double threshold | 13.24 | 0.2000 |
Note:
* p < 0.1.
