Sulfur dioxide is known as the most widespread environmental pollutant. Various chemisorbents and catalysts are commonly used to reduce its concentration in the air. The most effective chemisorbents are natural and synthetic zeolites, activated carbons, carbon fiber materials, metal oxide. The analysis of low-temperature methods for air purification from SO2 in the concentration not exceeded 15 MPC (150 mg/m3) showed that the application of chemisorption-catalytic processes with the participation of transition metal salts deposited on various carriers is promising. In the work, commercial synthetic zeolites of NaA and KA brands were used as carriers of transition metal salts. Chemisorption-catalytic compositions MX2/S̅ (S̅ = NaA, KA; M2+ = Cu, Mn, Co, Ni; X = Cl-, NO) for the oxidation of sulfur dioxide with air oxygen at ambient temperature and high humidity were obtained. The initial carriers and chemisorption-catalytic compositions were studied by XRD, SEM, FT-IR spectroscopy, TG, DTG-DTA. Zeolites NaA and KA have the same parameters of the crystal structure, which do not change when modified with transition metal salts. Under their influence, a slight decrease in the relative crystallinity was observed. The study has shown that NaA and KA samples differ in morphology. Clearly faceted cubic particles with a size of 0.7-1.0 microns were observed for zeolite NaA. Zeolite KA is characterized by aggregated particles of irregular shape of cubes and spherulites. When applying salts of transition metals, the shape of these particles is slightly disturbed. According to the data of thermogravimetric analysis, it has been found that copper (II) ions practically do not affect the temperature of the first (and only) endothermic effect, however, they reduce the content of OH groups due to the reaction of surface complexation. It was found that the adsorption capacity of NaA zeolite relative to SO2 is 100 times higher than that of KA zeolite (figure); the time of protective action of NaA and KA zeolites increases upon modification with transition metal salts and with an increase of their content in the compositions. С f SO2 , mg/m3 Taking into account the literature data regarding the mechanisms of SO2 oxidation with oxygen in the presence of transition metal ions, the possible mechanisms in the presence of MX2/compositions have been analyzed. It has been proven that the chemisorption-catalytic process ends with the oxidation of SO2 to sulfuric acid.