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Table 1 Muller’s classification for the geoaccumulation index

From: Spatial distribution and source identification of heavy metal pollution in roadside surface soil: a study of Dhaka Aricha highway, Bangladesh

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