I answered my own question, but since Rogue asked the same one I'll share... no doubt some people already know lol. Activated carbon / charcoal are widely used to adsorb odorous or coloured substances from gases or liquids.
In other words it will take some of the smell out of the air, that will be pumping into the room.
if you want to find out how it works go here.
http://www.howstuffworks.com/question209.htm

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