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Table 1

Classes of geo-accumulation index (Igeo)

ClassIgeo valuesLevel of contamination
Igeo ≤ 0 Uncontaminated 
0 < Igeo ≤ 1 Uncontaminated to moderately contaminated 
1 < Igeo ≤ 2 Moderately contaminated 
2 < Igeo ≤ 3 Moderately to strongly contaminated 
3 < Igeo ≤ 4 Strongly contaminated 
4 < Igeo ≤ 5 Strongly to extremely contaminated 
Igeo > 5 Extremely contaminated 
ClassIgeo valuesLevel of contamination
Igeo ≤ 0 Uncontaminated 
0 < Igeo ≤ 1 Uncontaminated to moderately contaminated 
1 < Igeo ≤ 2 Moderately contaminated 
2 < Igeo ≤ 3 Moderately to strongly contaminated 
3 < Igeo ≤ 4 Strongly contaminated 
4 < Igeo ≤ 5 Strongly to extremely contaminated 
Igeo > 5 Extremely contaminated 
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