Table 1 Muller’s classification for the geoaccumulation index
I geo value | Class | Soil quality |
|---|---|---|
≤0 | 0 | Unpolluted |
0–1 | 1 | From unpolluted to moderately polluted |
1–2 | 2 | Moderately polluted |
2–3 | 3 | From moderately to strongly polluted |
3–4 | 4 | Strongly polluted |
4–5 | 5 | From strongly to extremely polluted |
>6 | 6 | Extremely polluted |