[yourusername]

Dutch media is terrible and refuses to name the actual compounds involved (NOx and NH3) because that would require them to distinguish between the different sources of this pollution. So they've just been calling it "nitrogen" and so you get people repeating the assertion that there are dangerous levels of "nitrogen" in the air.

[tinco]

Yeah, I don't know what the proper English name for those compounds is. Is it nitric oxides and ammonia?