[PeterPrinciple]

nitrogen oxide, a highly polluting gas

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Sound evil doesn’t it folks? Does anyone remember the nitrogen cycle we were suppose to learn in school? It helps to form the ozone layer or shield which we are so concerned about. It helps to feed the plants. Ozone removes those pesky greenhouse gasses like methane from the atmosphere.

Systems and cycles are no longer discussed, whether, science, medicine government or religion or history.

[Redbob]

Actually, the componuds formed are all of the oxides of nitrogen, in varying quantities: NO, NO2, NO3, etc. thus the usage of NOx to describe them.
They are primary components of photochemical smog, as well as tending to form nitric and nitrous acids when combined with moisture in the air.