Your Acura overheating can cause high NOx. Nitrous Oxide or NO is created when an engine's combustion chamber temperature reaches over 2500F. Acura has designed several systems, which when working properly, lower nitrous oxide emissions.
First and foremost however you want to ensure your Acura does not have an overheating problem. From there you can check for a properly functioning EGR valve (if equipped), proper Air/Fuel ratio; a lean fuel condition will cause high NO as well, high compression, and finally a properly functioning Catalytic Converter.
