Abstract: An apparatus increases the efficiency and emissions of a combustion process by producing sufficient amounts of ozone in the air flow to the combustion chamber to enable more complete and cleaner combustion of the fuel. Embodiments of the invention include a plurality of cell elements disposed within a housing that is in placed in the air intake to a combustion chamber such as a diesel engine. The plurality of cell elements create an electrical plasma field that produces ozone. Other embodiments include a scrubber in the housing to cause the air flow to have a vortex action to increase the amount of ozone that flows into the combustion chamber.