NOx (nitrogen oxides)

NOx (nitrogen oxide) is a general term for various compounds such as NO, NO2, N2O, and N2O3 that are produced through the combination of nitrogen and oxygen when they reach states of complete combustion at high temperatures.
They are generated not only from engines but also from cigarettes and heaters, etc., and, since they are generated in increasing volumes as they approach complete combustion, combustion temperatures must be reduced.
High heat is generated due to explosive combustion during the "uncontrolled combustion period," causing temperatures in cylinders to rise sharply.
This is when NOx are generated. Furthermore, N (nitrogen) and O (oxygen), which are the components of NOx, have accelerated reactions at high temperatures, , which contributes to the generation of NOx.