Igeo Class | Igeo Class | Contamination level |
0 | Igeo ≤ 0 | Uncontaminated |
1 | 0 < Igeo < 1 | Uncontaminated/moderately contaminated |
2 | 1 < Igeo < 2 | Moderately contaminated |
3 | 2 < Igeo < 3 | Moderately/strongly contaminated |
4 | 3 < Igeo < 4 | Strongly contaminated |
5 | 4 < Igeo < 5 | Strongly/extremely contaminated |
6 | 5 < Igeo | Extremely contaminated |