This article statistically analyses the change rule of Yichun's heavy fog weather diurnal variation,month border change,year border change during1979～2008.The heavy fog in Yichun appears at night,dissipates after the sunrise,generally lasts for 3～6 hours.The heavy fog mainly concentrates in the summer,next for spring and autumn,but rarely appears in the winter The great foggy day was to be highest in 1990s,entered 2000 year great foggy day slowly reduced,but it did not have the obvious periodicity.The frequ...
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