Review Article
Analysis on the Development Status of Coal Mine Dust Disaster Prevention Technology in China
Table 2
Judgment standard for management limit of dust exposure concentration in coal mine workplace.
| | Type of dust | The content of free SiO2 in dust (%) | Maximum allowable concentration of respirable dust (mg/m3) |
| | Coal dust | ≤5 | 5.0 | | 5∼10 | 2.5 | | Rock dust | 10∼30 | 1.0 | | 30∼50 | 0.5 | | Cement dust | ≥50 | 0.2 |
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