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中文摘要：
利用1980-2009年沈阳台站观测的气象要素资料,采用适当的方法对沈阳的灰霾日进行判识和筛选,进而研究沈阳灰霾的长期变化趋势及分布特征。结果表明：1）近30年沈阳灰霾日波动减少,其年际变化特征与沈阳的工业转型模式相吻合;2）沈阳冬季平均灰霾日最多,秋季次之,当年10月至次年3月是灰霾的高发期。同时,灰霾在7、8月也时有发生;3）近30年沈阳的中度和重度灰霾日在总灰霾日中所占比例波动下降,对人体产生显著危害的灰霾日明显减少,沈阳城市空气质量呈总体上升趋势。
英文摘要：
Based on the data during 1980 and 2009 from the Shenyang weather station,proper measures were used to select the hazy days in Shenyang,on the basis of which the long-term change and distributing features were analyzed.The main conclusions were as follow：1）The hazy days had a fluctuant decreasing tendency in past 30 years and the change was in accordance with the industrial transformation model of Shenyang.2）The hazy days in winter were the most and had a peak during October and the next March.At one time,July and August were another peak for hazy days.3）The proportion of moderate and heavy hazy days in total hazy days decreased fluctuantly,which meant the hazy days harmful to health were getting lessen.It showed that the air quality improved on the whole in past 30 years.
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