Summary | Some Beijing residents use smokestacks to predict
smog: Smoke drifting gently upward means stagnant air where
smog will accumulate, while smoke blowing away from the
mountains indicates fresher winds and clear air ahead.
smog: Smoke drifting gently upward means stagnant air where
smog will accumulate, while smoke blowing away from the
mountains indicates fresher winds and clear air ahead.
chinadaily.com.cn | 06 January 2016