This Device Surrounds You In A Bubble Of Clean Air

You don't have to purify all the air—just the air around your head.

A decade ago, on flights to visit his family in Beijing while he was an engineering student at MIT, Raymond Wu started to think about the increasingly filthy air in the city. "My parents, my grandparents, were all breathing this not-so-good air," he says. "I could definitely tell that their health wasn't good as a result."

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