Nitrogen monoxide ($\mathrm{NO}$)

The atmospheric nitrogen oxide $\mathrm{NO}$. It consumes ozone when converted to nitrogen dioxide by $\mathrm{NO}+{\mathrm{O}}_3\to \mathrm{N}{\mathrm{O}}_2+{\mathrm{O}}_2$, but its oxidation by peroxy radicals instead enables net photochemical ozone production.