Occupation
No of mines
No of samples
Range (mg/m3)
Mean (mg/m3)
Continuous miner operator
21
178
0.02-21.44
4.08
Continuous miner helper
19
131
0.44-18.90
3.47
Cutting machine operator
15
98
0.71-15.42
3.69
Cutting machine helper
8
37
0.77-14.70
4.45
Coal drill operator
9
59
0.42-12.94
3.55
Loading machine operator
18
97
0.25-39.56
3.75
