From: Estimation of pollution indices and hazard evaluation from trace elements concentration in coastal sediments of Kerala, Southwest Coast of India
Enrichment factor
Sediment quality
EF < 2
Deficiency to minimal enrichment
2 < EF < 5
Moderate enrichment
5 < EF < 20
Significant enrichment
20 < EF < 40
Very high enrichment
EF > 40
Extremely high enrichment