NOX (X=1 or 2) emitted from stationery/mobile sources are conventionally deemed as notorious, anthropogenic precursors of ultrafine particulate matters (PM2.5) because NOX can undergo a series of SO2-assisted photochemical transformative stages to finally evolve PM2.5 functioning as an air pollutant. Recently, a research group in South Korea rectifies the general notion of NOX (vide supra) by proposing an interesting means to exploit NOX in creative fashion.
Click here for original story, Using radicalized NOₓ derivatives supported on metal oxides
Source: Phys.org