Igeo value

Igeo class

Intensity of pollution

<0

1

Practically unpolluted

0≤Igeo≤1

2

Unpolluted to moderately polluted

1≤Igeo≤ 2

3

Moderately polluted

2≤Igeo≤ 3

4

Moderately to strong polluted

3≤Igeo≤4

5

Strongly polluted

4≤Igeo≤5

6

Strong to very strongly polluted

> 5

7

Very strongly polluted

Tam and Wong (1995)*