The document discusses ways to reduce NOx emissions from combustion processes. It states that NOx emissions can be reduced by lowering combustion temperatures through techniques like staged combustion. Staged combustion involves introducing either the fuel or air into the combustion zone in stages, creating lean primary zones with lower flame temperatures that produce less NOx, followed by secondary zones to complete combustion. This can reduce NOx emissions by up to 90% compared to conventional non-staged combustion.