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http://www.wsj.com/articles/can-personal-air-purifiers-keep-cold-and-flu-bugs-away-1426523645

The Ache: In cold and flu season, pathogens spread when people are crammed into close quarters, such as airplanes and cars.

The Claim: Personal air purifiers worn around the neck clean the air in the wearer’s breathing zone of viruses and bacteria as well as allergens, say companies that sell them.

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This copy is for your personal, non-commercial use only. Distribution and use of this material are governed by our Subscriber Agreement and by copyright law. For non-personal use or to order multiple copies, please contact Dow Jones Reprints at 1-800-843-0008 or visit www.djreprints.com.