平均雾日较多的宜君、石泉和西安有较明显的年变化，大致有6年和8年的准周期。
The mean foggy days of Yijun, Shiquan and xi 'an exist obvious interannual change, about quasi-period of 6, 8 years.
利用上海11个气象站点近50年的雾日和霾日统计资料，从时间和空间两方面分析了上海雾、霾日数的气候特征和变化规律。
Based on the fog and haze data from 11 meteorological stations in Shanghai, the temporal and spatial climatic characteristics and change laws of fog and haze days in recent 50 years were analyzed.
海雾时数的年变化趋势与雾日相似，但从雾季过渡到非雾季，其变率比雾日大；
The annual trend of foggy hours is similar to foggy days', but the former has a bigger change rate than the latter in the transition of fog season to non-fog season;
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