An analytical model for ozone concentration calculations in an oxygen-fed wire-to-cylinder ozonizer is presented in order to improve our basic knowledge on ozone generation. This approach takes into account the physical and chemical phenomena. The Becker parameter is introduced and the ozone concentration deduced from this model is compared to the Vasil'ev relation, the macroscopic coefficients for ozone formation and destruction being expressed as functions of the kinetic coefficients. The general results (electron density, ozone concentration, macroscopic coefficients) are compared with experiments and a good agreement is observed.