The heavy and persistent haze and fog often occurred in East China recently are caused by high aerosol loading, associating with their formation, change, mixture, hygroscopic growth, CCN activations and static weather conditions. The adequate scientific judgment on the complexity and expectation of aerosol emission reduction in China is need when government sparing no effort to cut aerosol emission. This study has been published on Chin Sci Bull (Chin Ver), 2013,(13).
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