This does seem to be the world's smallest, lightest and ultra-portable air-purifiers you can get today. The portable USB Piezo-Ionizer plugs into your computer/notebook USB port and purifies air by emiting negatively charged ions, which destroy harmful bacteria and viruses. The USB pionizer claims to work for upto 10-15 square meters of room sizes and includes a 54" USB cable and a car adapter kit for using in a car.
We aren't sure how much effect this tiny USB ionizer can produce but it's worth a shot. Do tell us if it works for you.
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Available from Amazon for US $14.95.