Intelligent dry fog dust suppression system: an efficient Dust concentration and free silica were measured in the work zone (core zone) and buffer zone of Donimalai crushing and screening plant before installation (during January 4–10, 2018 and March 17–23, 2018) and after installation (during September 12–23, 2019 and November 21–23, 2019) of the dry fog dust suppression systemDust