Abstract: An emitter to deliver an electron flow towards particulate matter includes a base, a conductive track fixed to the base, and a plurality of conductive pins fixed to the base and extending therefrom in a predetermined direction and electrically coupled to the track so as to receive a negative electric charge therefrom. The emitter also includes a plurality of tubes, fixed to the base, and extending therefrom in said direction, with each of the tubes having an interior extending away from the base to an open end, and with each tube having at least one of the pins located in the interior thereof.

Abstract: An ionization unit is placed in an engine exhaust system. The ionization unit comprises an inlet to a first chamber and an outlet from a second chamber. Within the first chamber there is located an anode mesh and a grid mesh adapted to place a negative charge upon particulate matter passing through the first chamber. Within the second chamber there is located an anode element positively charged to attract the negatively charged particulate matter. Relatively clean air is exhausted at the outlet.