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The classes of soil quality based on Igeo values (Müller 1986; Loska et al. 2004; El-Badry and Khalifa 2017; Kowalska et al. 2018)
| Class | Value | Soil quality |
|---|---|---|
| 0 | Igeo ≤ 0 | Practically unpolluted |
| 1 | 0 < Igeo < 1 | Unpolluted to moderately polluted |
| 2 | 1 < Igeo < 2 | Moderately polluted |
| 3 | 2 < Igeo < 3 | Moderately to strongly polluted |
| 4 | 3 < Igeo < 4 | Strongly polluted |
| 5 | 4 < Igeo < 5 | Strongly to very strongly polluted |
| 6 | 5 < Igeo | Very strongly polluted |
