FIELD : medicine.SUBSTANCE : invention relates to medicine, namely, to hygiene and physiotherapy, and can be used to improve the efficiency of sylvinite physiotherapy rooms functioning. Alternate ozonation is carried out first with the right, then with the left salt panels of a sylvinite physiotherapy room for 5?minutes, each with an ozonizer with the Reynolds number of 3000, voltage of 15?kV, ozone concentration of 3?g O3/m3. Level of light negative air ions is measured. When reaching the concentration of light negative air ions at the level of 1500–1700?ion/cm3 from 24 to 48?hours after the beginning of ozonation, the effectiveness of sylvinite physiotherapy rooms functioning is estimated.EFFECT : method maintains a high concentration of light negative air ions for a long time, keeping the content of light positive ions at a constantly low level, moreover with increase in the level of carbon dioxide in the air in a room.1 cl, 1 dwg, 2 ex