Effects　of　discharge　power,　O-2　content,　reaction　temperature,　catalyst　introduction,　and　presence　of　NO　and　dichloromethane　(DCM)　on　the　formation　of　nitrogen　oxides　(N2O,　NO,　and　NO2)　by　discharge　in　N-2-O-2　mixture　have　been　systematically　investigated　using　a　dielectric　barrier　discharge　(DBD)　reactor.　Results　show　that　discharge　in　N-2-O-2　mixture　always　produces　several　to　hundreds　ppm　of　nitrogen　oxides　as　byproducts.　The　production　of　nitrogen　oxides　increases　with　the　increase　of　O-2　content　and　the　introduction　of　Al2O3　or　RuO2/Al2O3　catalyst.　N2O　production　first　increases　and　then　decreases/levels　off　with　increasing　discharge　power　at　room　temperature,　but　increases　monotonously　at　300　degrees　C.　NO　and　NO2　are　produced　only　at　relatively　high　discharge　power　at　room　temperature　but　are　produced　at　all　discharge　power　tested　at　300　degrees　C.　Increasing　the　reaction　temperature　from　room　temperature　to　300　degrees　C　significantly　reduces　the　production　of　N2O　but　increases　that　of　NO　and　NO2.　The　presence　of　hundreds　ppm　NO　in　N-2-O-2　mixture　significantly　reduces　the　production　of　N2O　due　to　the　effective　quenching　of　the　vital　species　for　N2O　formation　(N-2(A(3)sigma(+)(u)))　by　NO.　The　presence　of　hundreds　ppm　DCM,　however,　hardly　affects　the　production　of　nitrogen　oxides,　demonstrating　the　precedence　of　nitrogen　oxide　production　over　DCM　decomposition　in　N-2-O-2　plasma.