Table 2 Pollution indices and their classifications.
Cfa | Cdega | PLIb | PERIa | ||||
|---|---|---|---|---|---|---|---|
Range | Pollution intensity | Range | Pollution intensity | Range | Pollution intensity | Range | Pollution intensity |
Cf < 1 | Low contamination | Cdeg < 8 | Low degree of contamination | PLI < 1 | No pollution | RI < 150 | Low |
1 ≤ Cf < 3 | Moderate contamination | 8 ≤ Cdeg <16 | Moderate degree of contamination | 1 < PLI < 2 | Moderate pollution | 150 ≤ RI < 300 | Medium |
3 ≤ Cf < 6 | Considerable contamination | 16 ≤ Cdeg <32 | Considerable degree of contamination | 2 < PLI < 3 | Heavy pollution | 300 ≤ RI < 600 | significant |
Cf ≥ 6 | Very high contamination | Cdeg ≥ 32 | Very high degree of contamination | 3 < PLI | Extremely heavy pollution | RI ≥ 600 | Much |
