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中文摘要: 利用1961～2001年有烟日观测资料，统计分析了41年中，兰州市城区大气受烟尘污染的变化。结果表明:1961～1984年污染日在119～201天间徘徊;1985～1988年是污染“严重期”，年平均污染日达224天;1996～2001年为显著“好转期”，年平均污染日66天。一年中主要污染段是1月和11、12月，污染日占全年的49%。在污染日，大气水平能见度具有明显的日变化，能见度最差，污染最严重的时间是11～14时。
中文关键词: 大气，烟尘污染，年月变化，遥感监测
Abstract:The relationship between variation and meteorological condition of atmospheric pollution in the Lanzhou City is analyzed for the period of 1961—2001 by using the observational data of smoke days. The results show that the pollution days are about 119—201 in 1961—1984,serious pollution is in 1985—1988,the mean annual pollution days are 224,obvious improvement is in 1996—2002,and the mean annual pollution days are 66. In a year,the main polluting periods are January and from November to December,and the rate of pollution days is 49 percent. In pollution days,the visibility has distinct daily variation,the shortest distance of visibility and the most serious pollution phase are from 11:00 to 14:00.
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引用文本：
杨兰芳,李宗义,2004.兰州市城区大气烟尘污染的变化与气象条件分析[J].气象,30(8):53-56.
,2004.Variation of Atmospheric Pollution and Meteorological Conditions in Lanzhou City[J].Meteor Mon,30(8):53-56.
杨兰芳,李宗义,2004.兰州市城区大气烟尘污染的变化与气象条件分析[J].气象,30(8):53-56.
,2004.Variation of Atmospheric Pollution and Meteorological Conditions in Lanzhou City[J].Meteor Mon,30(8):53-56.