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In this study we report of the synthesis and application of photocatalytic properties of titanium dioxide nanoparticles for cleaning of organic pollutants in the air on the example of organic pollutant – ethylene. Photocatalytic process, realized by application of titanium dioxide nanoparticles, has been carried in various time and temperature regimes in UV-reactor. By deep coating method the glass beads were coated by titan dioxide nanoparticles, which have been preliminarily obtained by sol-gel method. By gas chromatography method was determined 70% degradation of gaseous ethylene by the application of photocatalytic properties of TiO2 nanoparticles.