Abstract: An exhaust treatment apparatus (ATA) for reducing one or more components of the airstream directed through the ATA. The ATA includes an airstream inlet, an airstream outlet, and an airstream path directed through the ATA from the airstream inlet to the airstream outlet, and at least one corona/NTP generating region for altering a composition of an airstream. The ATA includes an outer enclosure forming one electrode surface and a second electrode surface positioned within and electrically insulated from the outer enclosure electrode surface, where an area between the outer enclosure electrode surface and the second electrode surface forms at least a part of the airstream path directed through the ATA. The second electrode surface includes a series of ridges directed towards the outer enclosure that encourage corona generation.

Abstract: An exhaust treatment apparatus (ATA) is provided for reducing one or more components of the airstream directed through the ATA. The ATA includes at least one corona/NTP generating region, wherein at least one component of the airstream is reduced upon passing through the ATA. A method is provided for using the ATA for treating an airstream, including an exhaust airstream from a combustion engine, as well as an exhaust airstream from a compression-ignition (diesel) engine.