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. 2019 Jul 17;16(14):2552. doi: 10.3390/ijerph16142552

Table 2.

Classification of the geo-accumulation index.

Value Soil Quality
Igeo ≤ 0 Uncontaminated
0 < Igeo < 1 Uncontaminated to moderately contaminated
1 < Igeo < 2 Moderately contaminated
2 < Igeo < 3 Moderately to heavily contaminated
3 < Igeo < 4 Heavily contaminated
4 < Igeo < 5 Heavily to extremely contaminated
5 < Igeo Extremely contaminated