上海雾霾天气多吗冬天的雾霾是不是特别多??

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中国的雾霾多集中在华北地区,冬季会尤为严重.那为什么诸如上海地区也会在春天有严重雾霾?
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雾是空气潮湿,水蒸气含量高,夜间气温降低后水蒸气液化为小水滴形成的,我国大部分地区雾都集中在冬季,上海也是冬季最多,而不是春季最多.我国雾最多的地方是四川盆地.而霾是污染物颗粒悬浮在空气中形成的,华北地区空气污染比较严重,因此霾也最多.上海在空气扩散条件不良的情况下,也会出现霾,并且也容易和雾一同出现.而上海霾最多的也是冬季,春季并不很多
那为什么夏天和春天还是会有很多天重pm
春天夏天这种情况出现的概率就小很多,只会零星的出现
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