This study investigated the emission of N2O during the sequential aerated (60-min) and non-aerated (30-min) stages of an intermittent aeration cycle in an activated sludge wastewater treatment plant (WWTP).N2O emission occurred during both stages; however, emission was much higher during aeration.Air stripping is the major factor Lotions controlling transfer of N2O from the sewage to the atmosphere.The N2O emissions exclusively from the aeration 5 Piece Full Bedroom tank represented 0.10% of the influent total nitrogen load and the per capita emission factor was almost 3 times higher than that suggested by the IPCC for inventories of N2O emission from WWTPs.