气象万千：秋冬当心雾害

雾是近地面空气中的水蒸气发生的凝结现象。雾的形成有两个基本条件，一是近地面空气中的水蒸气含量充沛，二是地面气温低。秋冬季节，由于北方来的冷空气与南方来的暖湿空气经常在我国大陆交绥，在其交界处极易出

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