Class

Value

Levels of contamination

0

I_geo < 0

Uncontaminated

1

0 < I_geo < 1

Uncontaminated to moderately contaminated

2

1 < I_geo < 2

From contaminated to moderately contaminated

3

2 < I_geo < 3

From moderately contaminated to severely contaminated

4

3 < I_geo < 4

Severely contaminated

5

4 < I_geo < 5

From severely contaminated to extremely contaminated

6

5 < I_geo

Extremely contaminated