Abstract: A compact aerosol generator which produces, with a fresh air propellant, microscopically small liquid particles known as a dry aerosol particularly adapted for inhalation therapy has a cylindrical housing with a liquid container and a casing containing a baffling system. An air chamber and a manually operated liquid spray pump are defined by telescoping tubes in the housing. Liquid spray ejected from a nozzle at the outlet of the pump enters a jet tube which forms a venturi with a baffle adjacent the nozzle. Passages having their axes perpendicular to the axis of the nozzle provide communication between the air chamber and the jet tube in the vicinity of the outlet of the nozzle. When the telescoping tubes of the pump and air chamber enter each other, pressurized liquid spray and injected air, which is pressurized in this air chamber, flow and combine to efficiently form a spray which is atomized in the baffling system to provide the dry aerosol at the output of the generator.