“As I prepare for an upcoming trip to Beijing, both expat and Chinese friends have been sending me suggestions of the best gas mask to buy. An item considered rare or unnecessary as of late 2012 is now highly recommended for outdoor commutes during Beijing’s smoggiest days. But which mask should I use?  In addition to buying face masks, people in China who can afford them are also picking up indoor air filters. Most office workers spend 80 percent of their time indoors, but Beijing’s poorly insulated buildings can’t fully keep the smog outside.”

http://www.businessweek.com/articles/2013-05-06/new-travel-accessory-for-beijing-gas-mask#r=hpt-ls

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