Monitoring nitrous oxide (N2O) emissions from wastewater treatment plants has attracted much attention in recent years demanding accurate and rapid quantification methods. In the present study a salt-assisted methodology is proposed by which N2O is chemically stripped out from wastewater and quantified by gas chromatography (GC-TCD) subsequently. Eight different inorganic salts have been evaluated for this purpose, likewise the application of ultrasound. By addition of sodium bromide (NaBr) the best recovery rate of about 98% (=1.14±0.05kg·m−3) N2O from a saturated stock solution (1.16kg·m−3, 295.85K and 1atm) was achieved. The application of ultrasound led to considerable smaller N2O recoveries of 37% (=0.43±0.01kg·m−3) after a 60min treatment. Practical applicability of the method has been demonstrated by applying NaBr to grab samples from a municipal wastewater treatment plant. The highest N2O concentration was found in the secondary clarifier with 10.99±0.20g·m−3. Besides, N2O could be quantified in the activated sludge process with up to 9.87±0.50g·m−3 yielding 7.75gN2O·PE−1·a−1 specifically for the investigated wastewater treatment plant. Hence, the proposed method proved suitable as a routine quantification method for N2O.