VELOCITY ALERT: Shanghai's Disappearing Skyline: 21 Images of Record Pollution

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THIS STORY IS ABOUT TO GO VIRAL

Shanghai's Disappearing Skyline: 21 Images of Record Pollution Shanghai's iconic skyline has been slowly disappearing all week, cloaked by a thick acrid haze of smog. Reports of heavy pollution have circulated since Monday, but levels hit a new high on Friday. The unprecedented air pollution made it hard for residents to breathe and even see. How does Mashable know what's going viral? Mashable built a system called Velocity, which scours the social web, collecting lots and lots of data around how people are engaging with published articles. It then pulls all of that data back to Mashable, dumps it into our own predictive engine, and predicts which articles are about to go viral. Read more at Mashable.com ▶ Mashable, Inc. is a California Corporation. P.O. Box 64 New York, NY, 10159-0064

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