Abstract: The present invention relates to an apparatus and method for generating an aerosol of an exact dose for inhalation purposes. The inventive apparatus provides a temperature sensor 100 and/or a humidity sensor 200 in order to measure the ambient temperature of the system or the humidity of the air drawn in by the compressor 21. The sensors are preferably arranged adjacently between the outlet of a drying stage 25 and a dispersing nozzle 3. The maximum amount of a medicament that can be absorbed by a predetermined air volume can be determined (detected) by such determination of temperature and humidity. On the basis of this determination result, the supply of the appropriate amount of the medicament-containing liquid is controlled by a control means 5.