investigate its effectiveness on dust control and assess the viability
of using it in Hong Kong. In order to achieve the above objectives, an
experimental study has been designed and conducted to compare
the dust exposures between two groups of workers: one group dril-
ling the concrete without the use of DustBubble, the other with
DustBubble. Two variables have been analysed and compared:
respirable dust exposure and respirable silica dust exposure.
This paper first gives a short review of relevant literature,
including silicosis and related respirable exposure limits for respi-
rable dust and respirable silica dust. Then it turns to introduce how
to use DustBubble, after which the experimental study and analy-
sis methods are presented. Finally, the experimental results are
listed and discussed.