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Six Classes of the Geoaccumulation Index (Muller, 1981)
| Class | Value | Soil quality |
|---|---|---|
| 0 | Igeo ≤ 0 | practically uncontaminated |
| 1 | 0 < Igeo < 1 | uncontaminated to moderately contaminated |
| 2 | 1 < Igeo < 2 | moderately contaminated |
| 3 | 2 < Igeo < 3 | moderately to heavily contaminated |
| 4 | 3< Igeo < 4 | heavily contaminated |
| 5 | 4 < Igeo < 5 | heavily to extremely contaminated |
| 6 | 5 < Igeo | extremely contaminated |
