A personal ultrasonic atomizer device comprising: a cartridge having a reservoir for holding a liquid to be atomized; a sonication chamber, placed in fluid communication with the reservoir, and a member for controlling the amount of liquid flow into the chamber, wherein: the reservoir includes a first opening for providing air passage from the surroundings to the interior of the reservoir and a first aperture for providing a flow path from the interior of the reservoir to the sonication chamber; the member is engaged with the cartridge to be movable between a sealed position, at which the opening is closed, and a flow position, at which the opening is open; liquid held in the reservoir is discharged to the sonication chamber once the member is in the flow position, and liquid held in the reservoir remains in the reservoir when the member is in the sealed position, and at least a first slot through the member provides air passage from the surroundings, wherein: the slot is aligned with the opening when the member is in the flow position, and wherein the slot is misaligned with the opening when the member is in the sealed position, and optionally wherein the sealed position is an air-tight seal. a cartridge having a reservoir for holding a liquid to be atomized; a sonication chamber, placed in fluid communication with the reservoir, and a member for controlling the amount of liquid flow into the chamber, wherein: the reservoir includes a first opening for providing air passage from the surroundings to the interior of the reservoir and a first aperture for providing a flow path from the interior of the reservoir to the sonication chamber; the member is engaged with the cartridge to be movable between a sealed position, at which the opening is closed, and a flow position, at which the opening is open; liquid held in the reservoir is discharged to the sonication chamber once the member is in the flow position, and liquid held in the reservoir remains in the reservoir when the member is in the sealed position, and at least a first slot through the member provides air passage from the surroundings, wherein: the slot is aligned with the opening when the member is in the flow position, and wherein the slot is misaligned with the opening when the member is in the sealed position, and optionally wherein the sealed position is an air-tight seal. the reservoir includes a first opening for providing air passage from the surroundings to the interior of the reservoir and a first aperture for providing a flow path from the interior of the reservoir to the sonication chamber; the member is engaged with the cartridge to be movable between a sealed position, at which the opening is closed, and a flow position, at which the opening is open; liquid held in the reservoir is discharged to the sonication chamber once the member is in the flow position, and liquid held in the reservoir remains in the reservoir when the member is in the sealed position, and at least a first slot through the member provides air passage from the surroundings, wherein: the slot is aligned with the opening when the member is in the flow position, and wherein the slot is misaligned with the opening when the member is in the sealed position, and optionally wherein the sealed position is an air-tight seal.