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Table 4 Classification of geo-accumulation index

From: Estimation of pollution indices and hazard evaluation from trace elements concentration in coastal sediments of Kerala, Southwest Coast of India

Geo-accumulation index Igeo class Pollution intensity
 > 5 6 Very strongly polluted
 > 4–5 5 Strong to very strongly polluted
 > 3–4 4 Strongly polluted
 > 2–3 3 Moderately to strongly polluted
 > 1–2 2 Moderately polluted
 > 0–1 1 Unpolluted to moderate polluted
 < 0 0 Practically unpolluted
  1. Müller (1979)