Strict limits are being placed on nitrogen oxide emissions as emission laws and regulations are becoming increasingly stringent. These requirements are creating a worldwide need for better NOx sensor products for both transportation and industrial markets. To meet this demand, Nexceris has developed a new NOx sensing technology that rapidly and selectively measures NOx in combustion exhaust streams. This technology enables accurate quantification of NOx emissions at low concentrations (< 10 ppm) with response time less than 200 milliseconds – a capability that is particularly enabling for improved closed-loop emissions monitoring in diesel engine exhaust systems. Additionally, our sensor technology offers the potential for dual sensing of NOx and NH₃ in a single sensor device, which would be an important capability for silicon controlled rectifier (SCR) after-treatment systems.