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This paper discusses the gas-phase reaction mechanisms for removal of NOx in a plasma. The effect of oxygen content on the competition between the reduction and oxidation processes is discussed. The effect of the electron kinetic energy distribution on the radical production and subsequent chemistry is then discussed in order to predict the best performance that can be achieved for NOx reduction using the plasma alone. The fundamental limit on the minimum electrical energy consumption that will be required to implement NOx reduction in any type of plasma reactor is established.