Classification of single indices: Igeo, EF, CF and PI
| Index | Formula | Value | Classification |
|---|---|---|---|
| Geoaccumulation Index (Igeo) | Igeo ≤ 0 | Uncontaminated | |
| 0 < Igeo ≤ 1 | Uncontaminated to slightly contaminated | ||
| 2 < Igeo ≤ 3 | Moderately to heavily contaminated | ||
| 3 < Igeo ≤ 4 | Heavily contaminated | ||
| 4 < Igeo ≤ 5 | Heavily to extremely contaminated | ||
| Igeo > 5 | Extremely heavily contaminated | ||
| Enrichment Factor (EF) | EF ≤ 2 | Very low enrichment | |
| 2 < EF < 5 | Moderate enrichment | ||
| 5 < EF < 20 | Significant enrichment | ||
| 20 < EF < 40 | Very high enrichment | ||
| 40 ≤ EF | Extremely high enrichment | ||
| Contamination Factor (CF) | CF ≤ 1 | Low contamination | |
| 1 < CF < 3 | Moderate contamination | ||
| 3 < CF < 6 | Significant contamination | ||
| 6 ≤ CF | Very high contamination | ||
| Pollution Index (PI) | PI ≤ 1 | Unpolluted to lightly polluted | |
| 1 < PI < 3 | Moderately polluted | ||
| 3 ≤ PI | Heavily polluted |
| Index | Formula | Value | Classification |
|---|---|---|---|
| Geoaccumulation Index ( | Uncontaminated | ||
| 0 < | Uncontaminated to slightly contaminated | ||
| 2 < | Moderately to heavily contaminated | ||
| 3 < | Heavily contaminated | ||
| 4 < | Heavily to extremely contaminated | ||
| Extremely heavily contaminated | |||
| Enrichment Factor ( | Very low enrichment | ||
| 2 < | Moderate enrichment | ||
| 5 < | Significant enrichment | ||
| 20 < | Very high enrichment | ||
| 40 ≤ | Extremely high enrichment | ||
| Contamination Factor (CF) | CF ≤ 1 | Low contamination | |
| 1 < CF < 3 | Moderate contamination | ||
| 3 < CF < 6 | Significant contamination | ||
| 6 ≤ CF | Very high contamination | ||
| Pollution Index ( | Unpolluted to lightly polluted | ||
| 1 < | Moderately polluted | ||
| 3 ≤ | Heavily polluted |
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