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Analysis on The Contributing Factors of A Typical Serious Air Pollution Episode in Winter of Dalian

Bao Yanying;Ji Deyu;Xu Jie;Dalian Environmental Monitoring Center;  
The causes of a typical serious air pollution episode occurred in Dalian city on December28 ~29, 2014 was studied in term of the evolution of pollution process, the evolution of weather conditions, the change of particle composition, pollution transportation analysis, and backward trajectory analysis.The major results were as follows:(a) the stable atmospheric circulation, small wind speed and high humidity in surface provided favorable meteorological conditions for the accumulation of serious pollution.(b) the continuously pollution transmission from Beijing, Tianjin and Hebei region was the main reasons for the formation of the serious air pollution episode.
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