A Roadheader district produces 20 mg/m3 of airborne dust with the following size distribution:
| Size up to | Cumulative wt% |
| 1 μm | 1 |
| 5 μm | 5 |
| 10 μm | 10 |
| 20μm | 20 |
| 50μm | 50 |
| >50μm | 100 |
A. 0.2
B. 2.0
C. 10.0
D. 1.0
Answer: Option D
This Question Belongs to Mining Engineering >> Mine Ventilation
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