Ozone is generated by directing ambient air through a co-axially oriented cathode and anode. In a preferred embodiment, the outer electrode is a tubular cathode, with the anode disposed about a longitudinal axis therein. The anode is provided with a plurality of vane assemblies, with each individual vane canted at an angle of from about 15° to about 70°, and preferably about 45°, to the planar body of the vane assembly. Air flow is provided either coincident with the longitudinal axis, or tangentially thereto.