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We report simultaneous removal of NO and SO2 by Fe(II)EDTA2− absorbent in a wet absorption system. Effects of various operation parameters, such as Fe(II)EDTA2− concentration, solution volume, NO inlet concentration, and pH of absorption solution on NO absorption in a semi-batch reaction, were investigated. NO loading capacity increased with increasing NO inlet concentration since NO loading capacity was highly influenced by NO inlet concentration. NO loading capacity increased in neutral and alkaline environments compared to that in an acidic one. To evaluate NO absorption performance of practical flue gas components, simultaneous absorption of NO and SO2 in the presence of O2 over Fe(II)EDTA2 was carried out. As a result, when all gas emission components (NO, SO2 and O2) were introduced, simultaneous removal of NO and SO2 was obtained with a high NO loading capacity (ca. 88.8%). Antagonistic effects of both SO2 and O2 played an essential role in the regeneration of Fe(III)EDTA and Fe(II)EDTA-NO2 to Fe(II)EDTA2, keeping a neutral pH of absorption solution and resulting in a dramatic improvement in the absorption of NO and SO2. [ABSTRACT FROM AUTHOR]