(Bloomberg) -- The smog that blanketed Beijing in December has returned in the New Year. Beyond the capital, 61 cities have issued health alerts, forcing the cancellation or delay of hundreds of flights. Air pollution in Beijing last month triggered a red alert -- the highest level of warning.
--With assistance from Foster Wong To contact Bloomberg News staff for this story: Yan Zhang in Beijing at yzhang1044@bloomberg.net. To contact the editors responsible for this story: Ken Wills at kwills3@bloomberg.net, Jake Ulick
With assistance from Yan Zhang
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