Experimental results obtained with a wire-to-cylinder ozone generator (5-20cm in length, inner diameter ∼ 12mm), using a 5 to 60l/h flow-rate range of air or N2+O2mixtures, a negative D.C. high voltage being applied to the wire, are analyzed. As for the “classical” industrial ozonizers, the chemical engineering method, based on the energy density concept (Becker parameter β=P/Q) and the global coefficients of formation Kfand destruction Kdof ozone, was applied. Some peculiar behavior of the Kfcoefficient and the role played by nitrogen and its excited levels are pointed out. The results obtained are compared with those of other authors. It appears clearly that the main parameters are not only the Becker parameter but also, and independently, the applied electrical power (P) and gas flow rate (Q) through the residence time (tr). The residence time (or contact time) of the reactant gas with the corona discharge inside the reactor seems to be about some seconds