In Japan, Tokyo it is common to see Japanese people walking around with masks like the kind Surgeons wear during surgeries.
Why do the Japanese wear masks like Surgeons in Tokyo?
closed as off topic by Ankur Banerjee♦ Mar 20 '12 at 21:37
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I always thought it was to avoid breathing too much pollution or avoid catching diseases from other people.
In fact it's the other way around. My Japanese friend always wears one when she has a cold because she doesn't want to infect other people!