Class

Values of I_geo

Soil quality

0

I ≤ 0

Unpolluted

1

0 - 1

unpolluted to moderate pollution

2

1 - 2

moderate pollution

3

2 - 3

moderate to high pollution

4

3 - 4

high pollution

5

4 - 5

high to extreme high pollution

6

5 - 6

extreme high pollution