Pollution Tolerance Index Rating
Calculated as follows:
4*(# of Taxa in PT Group 1) + 3*(# of Taxa in PT Group 2) + 2*(# of Taxa in PT Group 3) + 1*(# of Taxa in PT Group 4)
23+ (Excellent)
17-22 (Good)
11-16 (Fair)
0-10 (Poor)
PTI Rating for This Report: