| Er Value | Potential Ecological Risk | RI Value | Ecological Risk Index |
| Er < 40 | Low | RI < 95 | Low |
| 40 ≤ Er <80 | Moderate | 95 ≤ RI < 190 | Moderate |
| 80< Er <160 | Considerable | 190 ≤ RI < 380 | Considerable |
| 160≤ Er < 320 | High | 380 ≤ RI | Very High |
| Er ≥ 320 | Very high |
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