A new Japanese Ministry of Health document provides regulations and guidelines for the allowable dust concentration in tunnel works. The recommended maximum concen-tration should be less than 3.0 mg/m3 (2.3 mg/y3) at 50 m (164 ft) from the tunnel face. To observe this guideline, it is a serious problem as to how to reduce the generation of mineral particles of dust during shotcreting operations. In general, shotcrete is placed using pneumatic energy. This is a main factor causing dust generation during shotcrete operations. It may be easily imagined that if shotcrete application can be conducted by centrifugal force, dust concentration would be dramatically reduced. In this paper, we describe the development of a centrifugally sprayed shotcrete system named Dustless Shotcrete and also provide the results of a practical application of this technology at the Hishino Tunnel.