Area | Sample number | Pi | Comprehensive pollution index | |||||
Cr | Zn | Ni | As | Pb | Cu | |||
City Proper | 62 | 0.50 | 0.34 | 0.38 | 0.20 | 0.09 | 0.21 | 0.41 |
Countryside | 7 | 0.43 | 0.19 | 0.08 | / | 0.03 | 0.32 | 0.24 |