A gas turbine engine system, comprising: a gas turbine engine comprising: a compressor and an inlet air conditioner upstream of the compressor; the compressor comprising a plurality of inlet guide vanes; a nitrogen oxides reduction system in communication with a flow of combustion gases downstream from the gas turbine engine; and a nitrogen oxides controller operable to control the ratio of nitrogen dioxide to nitrogen monoxide in the flow of combustion gases entering the nitrogen oxides reduction system, wherein the nitrogen oxides controller comprises a nitrogen dioxide sensor and a nitrogen monoxide sensor positioned about the reduction system, a divider to produce a ratio signal representing a ratio of nitrogen dioxide to nitrogen monoxide in a flow of combustion gases entering the reduction system, an emissions look up table to produce a ratio indication signal and a multiplier to produce an exhaust temperature offset signal, wherein the exhaust temperature offset signal causes the inlet air conditioner to change a temperature of an incoming flow of air to the compressor, a plurality of inlet guide vanes to change a flow rate of the incoming flow of air, and/or a fuel system to change a flow rate of a flow of fuel to a combustor, such that a temperature of the flow of combustion gases entering the nitrogen oxides reduction system changes until a desired ratio of nitrogen dioxide to nitrogen monoxide in the flow of combustion gases entering the nitrogen oxides reduction system is met; the controller further comprising an amplifier in communication with the multiplier and limiter in communication with the divider. a gas turbine engine comprising: a compressor and an inlet air conditioner upstream of the compressor; the compressor comprising a plurality of inlet guide vanes; a nitrogen oxides reduction system in communication with a flow of combustion gases downstream from the gas turbine engine; and a nitrogen oxides controller operable to control the ratio of nitrogen dioxide to nitrogen monoxide in the flow of combustion gases entering the nitrogen oxides reduction system, wherein the nitrogen oxides controller comprises a nitrogen dioxide sensor and a nitrogen monoxide sensor positioned about the reduction system, a divider to produce a ratio signal representing a ratio of nitrogen dioxide to nitrogen monoxide in a flow of combustion gases entering the reduction system, an emissions look up table to produce a ratio indication signal and a multiplier to produce an exhaust temperature offset signal, wherein the exhaust temperature offset signal causes the inlet air conditioner to change a temperature of an incoming flow of air to the compressor, a plurality of inlet guide vanes to change a flow rate of the incoming flow of air, and/or a fuel system to change a flow rate of a flow of fuel to a combustor, such that a temperature of the flow of combustion gases entering the nitrogen oxides reduction system changes until a desired ratio of nitrogen dioxide to nitrogen monoxide in the flow of combustion gases entering the nitrogen oxides reduction system is met; a compressor and an inlet air conditioner upstream of the compressor; the compressor comprising a plurality of inlet guide vanes; a nitrogen oxides reduction system in communication with a flow of combustion gases downstream from the gas turbine engine; and a nitrogen oxides controller operable to control the ratio of nitrogen dioxide to nitrogen monoxide in the flow of combustion gases entering the nitrogen oxides reduction system, wherein the nitrogen oxides controller comprises a nitrogen dioxide sensor and a nitrogen monoxide sensor positioned about the reduction system, a divider to produce a ratio signal representing a ratio of nitrogen dioxide to nitrogen monoxide in a flow of combustion gases entering the reduction system, an emissions look up table to produce a ratio indication signal and a multiplier to produce an exhaust temperature offset signal, wherein the exhaust temperature offset signal causes the inlet air conditioner to change a temperature of an incoming flow of air to the compressor, a plurality of inlet guide vanes to change a flow rate of the incoming flow of air, and/or a fuel system to change a flow rate of a flow of fuel to a combustor, such that a temperature of the flow of combustion gases entering the nitrogen oxides reduction system changes until a desired ratio of nitrogen dioxide to nitrogen monoxide in the flow of combustion gases entering the nitrogen oxides reduction system is met; the controller further comprising an amplifier in communication with the multiplier and limiter in communication with the divider.