| Index | Range | Classification | samples | % |
| CR | <10−6 | cause no significant health effects | 10 | 100 |
| HQ | <1 | Acceptable level (no concern) | 10 | 100 |
|
| >1 | carcinogenic adverse effects |
|
|
| HI | <1 | Safe | 09 | 90 |
|
| >1 | Unsafe | 01 | 10 |