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Table 6 Classification of degree of contamination

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

Cd levels Degree of contamination
Cd < 8 Low degree of contamination
8 ≤ Cd < 16 Moderate degree of contamination
16 ≤ Cd < 32 Considerable degree of contamination
Cd ≥ 32 Very high degree of contamination indicating serious anthropogenic pollution
  1. Bramha et al. (2014) and Sivakumar et al. (2016)