Almost quantitative absorption of NO is achieved in nitric acid solutions containing sodium chlorite, sodium hypochlorite, or chlorine gas at temperatures up to 80°C and atmospheric pressure. Experiments are conducted by bubbling various mixtures of NO, NO2and O2, with the balance N2into varying volumes of scrubbing solutions up to one dm3. When scrubbing with acidic NaClO2, a greenish yellow color is observed in the solution when the gaseous mixture is bubbled into the liquid containing the oxidizing compound. The color is due to the presence of ClO2gas, an intermediate active in the oxidation of NO. Results in acidic NaClO or Cl2show similar results, except the intermediate that actually promotes the oxidation is HClO. These intermediates were identified spectroscopically. Material balances, determined using ion chromatography, show that the only anions in solution at NO breakthrough are NO3−and Cl−.