The path of nitrogen and the emissions of nitrogen oxides, such as NO, NO2, and N2O (NyOx), have been evaluated via experiments at a 120 kW dual-circulating fluidized-bed chemical looping pilot plant. Natural gas has been used as fuel, and its fuel nitrogen content has been varied by adding ammonia (NH3) as a model NyOx precursor up to a total fuel N content of 1.36 wt %. A nickel-based oxygen carrier with an active NiO content of 40 wt % has been used. While NH3 conversion was practically complete with below 8 ppmv [dry basis (db)] NH3 in the fuel reactor exhaust gas, the concentration of NO was always below 6 ppmv (db) in the air reactor and no NO was detected in the fuel reactor exhaust gas. Concentrations of NO2 and N2O were below the detection limit of the equipment used (<2 ppmv) during the whole experimental campaign. Fuel nitrogen is effectively converted to N-2, and thermal NO formation is low in the air reactor. With regard to emission regulations, all measured concentrations are below current limits. Concentrations are also below all recommendations regarding CO2 purity considerations.