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京城霧霾

節能降耗控霾見初步成效：京都接觸造成的污染灰色預警系統_66KM

親身經歷了2009年造成情況極限之中的氣流被污染，北京最終去掉了氣流被污染灰色警告。節能局寫出，單雙號限行此事次控霾發揮出來了偏態用處，PM2.5下滑1/5。

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