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The production of ozone by negative corona discharge from O2 + CCl2F2 (CFC12) mixtures is experimentally investigated at two pressures of gaseous mixture of 800 and 900 mbar in the CCl2F2 concentration range of (0–7)%. The efficiency of ozone generation is remarkably reduced with increasing content of CCl2F2 in the mixture with oxygen. The effect is more apparent at lower pressure of gaseous mixture. In order to identify the most likely process responsible for the inhibition of ozone production a discussion of the chemical kinetics of various processes is presented.