In different duration, the annual changes of occurrence frequency of heavy fog in Hefei area were different.
在不同持续时间内，合肥地区大雾出现频数的年变化不同。
The number of thunderstorm day and the fog day was increased but the sunshine duration was decreased.
另外，呼和浩特市雷暴日数、雾日数增加了，而日照时数在减少。
The number of thunderstorm day and the fog day was increased but the sunshine duration was decreased.
另外，呼和浩特市雷暴日数、雾日数增加了，而日照时数在减少。
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