Grades of Nemerow pollution index

Terminologies used for Pollution Grade

P_nemerow ≤ 0.7

0.7 < P_nemerow ≤ 1

1 < P_nemerow ≤ 2

2 < P_nemerow ≤ 3

P_nemerow > 3

Clean

Warning limit

Slight pollution

Moderate pollution

High pollution