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Grading of ecological risk of some trace elements in the deposited dust around the Mehdi Abad Pb/Zn mine using mHQ index
| Grading | ||||||||
|---|---|---|---|---|---|---|---|---|
| mHQ | Nil to Very Low Severity | Very Low Severity | Low Severity | Moderate Severity | Considerable Severity | Very High Severity | High Severity | Extreme Severity |
| Sample (N or %) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9 (%100) |
