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Classification of the geo-accumulation index.
| Value | Soil Quality |
|---|---|
| Igeo ≤ 0 | Uncontaminated |
| 0 < Igeo < 1 | Uncontaminated to moderately contaminated |
| 1 < Igeo < 2 | Moderately contaminated |
| 2 < Igeo < 3 | Moderately to heavily contaminated |
| 3 < Igeo < 4 | Heavily contaminated |
| 4 < Igeo < 5 | Heavily to extremely contaminated |
| 5 < Igeo | Extremely contaminated |
