A 23-foot-tall air purifier is getting a tryout in smoggy Beijing: http://www.nytimes.com/2016/07/21/us/a-23-foot-tall-air-purifier-gets-a-tryout-in-smoggy-beijing.html?_r=1&mc_cid=518020b1c1&mc_eid=acd6b24698 …pic.twitter.com/ZtPGmgVUZr
11:09 AM - 22 Jul 2016
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