Table 3: Comparison of the average concentration level of mercury in hair samples in Study area with the levels in different countries (Mean mg/kg).
| Country | Hg | Reference |
| Poland | 0.50 | [16] |
| Japan | 3.18 | [17] |
| Turkey | 0.43 | [18] |
| Sweden | 0.26 | [19] |
| Brazil | 0.62 | [20] |
| Spanish | 1.80 | [21] |
| *Butana (Study area) | 4.70 | This study |
*This study.