In the Ag(II)/Ag(I) redox mediator integrated scrubber system, NO reacts with the Ag(II) ions produced by the electrochemical oxidation of Ag(I) in an electrochemical cell present in the scrubbing solution (aqueous HNO3 acid) to form NO2. This NO2 is then absorbed into the scrubbing solution and degraded to nitrate. Numerous experimental runs were carried out to evaluate the feasibility of the integrated system to treat industrial waste gases containing high NOx levels. The results showed that the levels of NO and NOx removal increased with increasing Ag(II) loading and contact time. Under optimized conditions, 93.5% and 73.3% of the NO and NOx, respectively, were removed by a single stage gas scrubber with 1.62 g L-1 Ag(II) operating at 25 degrees C and atmospheric pressure. Crown Copyright (c) 2012 Published by Elsevier B.V. on behalf of The Institution of Chemical Engineers. All rights reserved.