Abstract: A road cleaning or sweeping machine (10) fitted with a dust control system using a water atomiser (42, 60). The atomiser (42, 60) creates water particles of a similar size to dust, and by entraining atomised water through the road sweeping machine's dust handling systems, i.e. from the brushes (14), through a suction pipe (20) and into a hopper (16), dust control is established. A method of improving dust separation in a hopper (16) of a road sweeping machine (10) using a water atomiser to reduce dust or a spray to wet the walls of the hopper (16).