Originally Posted by darkmother
Any idea if those things actually do anything? I can imagine it would be really uncomfortable, like wearing one of those hospital masks everyone had when all that SARS BS was floating around. Plus, it has to be hard to breathe through, right?
http://www.bikeforums.net/showthread.php?t=105381
A guy I know who has mild asthma and rides with one on pollution days actually stopped wearing it during the SARS incident for public-perception reasons.