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Wet flue gas desulfurization (WFGD) provides highly efficient SO 2 removal in industrial flue gas treatment. Although NO and NO 2 are not readily absorbed in the traditional desulfurization wash tower, deep oxidation with ozone can promote the formation of N 2 O 5 that is absorbed in the washing fluid, making possible simultaneous denitration and desulfurization in the WGFD unit. This paper presents a survey of operating parameters for NO x removal after ozone deep oxidation using a Na 2 CO 3 -based WFGD. The effects of preoxidation time, Na 2 CO 3 aqueous solution concentration, spray liquid/gas ratio, gas residence time in wash tower, and SO 2 concentration on NO x removal efficiency were investigated systematically in a variable-configuration experimental setup. The results demonstrate that preoxidation time was the most sensitive factor in N 2 O 5 formation, although oxidation continued in the wash tower. Thus, one strategy for a system where physical constraints limit the volume of the oxidation chamber is to extend the flue gas residence time in the wash tower. Increasing the liquid/gas ratio and Na 2 CO 3 solution concentration gave some enhancement on the wet absorption process. Under optimal laboratory conditions, 95% NO x removal efficiency was achieved. Addition of SO 2 yielded a slight inhibition for NO x removal, and under industrial relevant operating conditions, 98% SO 2 and 62% NO x removal was achieved during 50 min experimental runs.