Abstract: The present invention relates to methods for producing an aerosol and may be useful in chemical, petrochemical and pharmaceutical industries, as well as in household applications, in medicine. The method for producing an aerosol consists in subjecting the medium to be dispersed to the action of ultrasonic oscillations with the help of a source of oscillations, containing a piezoelectric element. The source of oscillations is made with a possibility of dispersing a liquid and/or loose medium and adjusting the size of aerosol drops by varying the oscillations, the liquid and/or loose medium to be dispersed being acted upon in a standing-wave mode. The frequency of oscillations is varied within a range close to the resonance frequency of the macrostructure of the liquid and/or loose medium to be dispersed, and/or is maintained equal to the resonance frequency of the macrostructure of the liquid and/or loose medium to be dispersed. A fine-dispersed aerosol is formed, with a size of drops not larger than 0.