Ambient air in ground wards made to contain natural potassium-sodium salt is close in characteristics to the atmosphere of underground wards but has a number of specificities: daily fluctuations of concentrations of light aeroions and aerosol particles, elevated concentration of light aeroions concentration, low radiation background, minimal bacterial contamination. The stay in ground wards brings great benefit for patients with bronchial asthma. Ground speleo-climatic wards are perspective in nonpharmacological treatment of patients with allergic respiratory diseases.