Exhaust gas purification I'm more asking this because I'm not sure how far science has come.
Pretty much, I've been thinking about the car exhaust system lately. The two main components that lead to hazards from cars are $\ce{CO}$ and $\ce{NO_{$x$}}$. Carbon monoxide is hazardous because it thrives to become $\ce{CO2}$ and robs living beings of the oxygen in their bloodstream to become carbon dioxide. And the nitrogen oxides are hazardous only as that compound, but nitrogen and oxygen are quite harmless as $\ce{N2}$ and $\ce{O2}$.

Would it be possible to separate the oxygen from $\ce{NO_{$x$}}$ and somehow give that to the $\ce{CO}$, and any left over oxygen simply becoming $\ce{O2}$?

This all might be a stretch, but I have an active imagination and like seeking out answers to these questions.
This pretty much what happens (among other processes) in a three-way catalyst of a car:

$$\ce{2CO + 2 NO -&gt;[\mathrm{cat}] 2CO2 +N2}$$