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This paper describes the experimental study of indoor air control by the plasma catalytic hybrid system. The basic characteristics of the ammonia and toluene decomposition were investigated as a model of the deodorizing process. It was found that the application of plasma discharge without catalyst can be dangerous for humans due to the ozone and carbon monoxide (CO) formation. The catalyst, which was applied to the plasma unit, decreases the ozone concentration more than ten times and the CO amount up to five times. Catalyst decreases a little bit the ions generated by the discharge but the catalyst application in the plasma treatment was recognized as necessary. The plasma catalytic hybrid system can be a promising method of the indoor air ionization and deodorization.