EF | value | Class | Designation of soil quality (enrichment level) | PERI value | PERI class | Designation of soil quality (PERI) | Igeo Value | Igeo Class | Designation of soil quality (Pollution Intensity) |
<1 | <1 | 0 | no enrichment | <40 | 0 | low risk | ≤0 | 0 | Uncontaminated |
1 - 2 | EF < 2 | 1 | depletion or deficiency to minimal enrichment | ≤40 < 80 | 1 | moderate risk | 0 - 1 | 1 | uncontaminated to moderately contaminated |
2 - 5 | EF 2 - 5 | 2 | moderate enrichment | 80 ≤ PERI < 160 | 2 | considerable risk | 1 - 2 | 2 | moderately contaminated |
5 - 20 | EF 5 - 20 | 3 | significant enrichment | 160 ≤ PERI < 320 | 3 | high risk | 2 - 3 | 3 | moderately to strongly contaminated |
20 - 40 | EF 20 - 40 | 4 | very high enrichment | ≥320 | 4 | very high risk | 3 - 4 | 4 | strongly contaminated |
>40 | EF > 40 | 5 | Extremely high enrichment |
|
|
| 4 - 5 | 5 | strongly to extremely contaminated |
| ≥5 | 6 | extremely contaminated |