Personal respirable samples were collected and analysed for two situations: workers drilling with DustBubble, and workers drilling without DustBubble. The
respirable dust concentrations and respirable quartz concentrations were compared. The results revealed that the use of DustBubble could reduce the respirable dust concentrations by 63%. However, there was no evidence that the use of Dust Bubble could reduce the respirable quartz exposure. Dust Bubble alone is inadequate and other dust control measures (e.g. wet methods, LEV and PPEs) should be taken to reduce the quartz exposure level to below
the exposure limit. Since DustBubble could reduce the respirable dust significantly, further research should be conducted to further evaluate and improve the effectiveness of DustBubbles (especiallyon respirable silica dust).