Abstract: NO.sub.x and SO.sub.x molecules are separated from a combustion exhaust gas stream by directing the exhaust gases through an elongated passageway, establishing a logarithmic potential across that passageway which will cause separation of the NO.sub.x and SO.sub.x molecules from the exhaust gases based on their permanent dipole moments, the potential being established between spaced conductors and at a relatively low voltage level sufficient to generate a capacitance between the conductors sufficient to cause separation of the molecules from the exhaust gas stream for recovery in a separate chamber.

Abstract: A method and apparatus for maintaining the optimum oxygen level in a power plant, such as, an internal combustion engine comprises a combination of a pollutant sensor associated with the exhaust of the engine to generate electrical signals proportional to the level of pollutants in the exhaust stream, a supplementary oxygen source and a flow control valve which is responsive to the signal generated by the pollutant sensor to open the valve for flow of oxygen at a flow rate proportional to the electrical signal until the pollutant level is reduced to a predetermined value.