Behold the USB port: it can help you perform an ultrasound, power your ashtray, help you detect ghosts, and now, purify the air in your car, home or office. Catagorized as a USB device by Inovix, the IAP565A Car & Computer Air Purifier circulates negative ions, removes pollutants, eliminates cigarette smoke and reduces odors.
I'll admit, I'm not sure where the USB part comes in - unless it's powered by a handy-dandy USB port (like everything else these days). Easy enough to find in your home or business offices...but probably in shorter supply in your automobile. I suppose you could always bring your laptop out to your car. Or, if you prank your friends by dismantling their car and reassembling it in their home office, you could always plug the Car & Computer Air Purifier into an empty USB port in their home computer, and tell them you were just trying to improve their environment.
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There are car radios with USB ports you can use this with. See here
http://www.autotoys.com/x/cust/home.php?cat=1056