Venturi scrubbing is the most effective technique for the removal of particulates from a gas stream, even down to sub-micron size. Scrubbing liquor and gas streams are brought together in turbulent contact within the venturi throat and the particulates are forced into the atomized liquor. Venturi scrubbing may be adequate to handle some more reactive contaminants but to reduce fumes to acceptable levels it may be necessary to effect further treatment using a packed tower scrubber. Combination units incorporating both types of scrubber using a common sump are most practical in some circumstances. Venturi scrubbing is typically a cost-effective and efficient approach to removing particulates.