[steve_adams_86]

You'd need a specific wavelength (265nm seems to be the standard) and they get pretty expensive. A UV LED from adafruit or sparkfun will probably not be sufficient.

At a glance they sell LEDs around 400nm which from my cursory reading wouldn't be effective for what you're imagining.

Not to say this would never work. Just that you would need special parts that are less common and more expensive by orders of magnitude.

I've also read that sterilizing very fast moving air doesn't work well. It seems HVAC systems use extremely intense light order to be effective in these conditions, which a small LED (or a few) wouldn't accomplish.