http://urbanlegends.about.com/od/medical/a/swine_flu_facts_onions_and_flu.htm ppl got this kind of email from others and tried it out.so did my mum.

here's the truth, no scienctific prove! onions,although they have absorbent properties,DO NOT absorb the poisons in the air.

well,if you dont believe tis,just try it..you'll just waste some money on onions and when some part if the onion turns black,your room will just stink...like mine did...