a carbon - based electrode device and a ddbd system for air purification and the production of ozone . the air treatment system is designed , in one embodiment thereof , to be operational in a double stage cycle involving the production of ozone - enriched air and the disintegration of air - borne pollutants , in a first stage ; and the decomposition of residual ozone in the air , in a second stage . the multi - electrode crisscross array of the present invention features geometrical placement of the electrodes in triads to increase the efficiency of the system via two parameters , the close proximity of oppositely charged electrodes and the multiplicity of electrodes configured in triads , that is , crisscross arrays of three .