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Table 2 Classification of enrichment factor

From: Effect of urbanization on heavy metal contamination: a study on major townships of Kannur District in Kerala, India

Enrichment factor Soil 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
  1. Veerasingam et al. (2012) and Petrelli et al. (2016)