According to the environmental air quality monitoring data of Yulin city, it analyzed the pollution characteristics of air quality and changing trends of major pollutants from 2001 to 2010. The results indicated that: between 2001-2010 , the trends of SO2、 NO, and particulate matters in Yulin city were declined overall; between 2007-20 l0,the seasonal pollution characteristics of SO2 and PM10 were obvious, the climax of S02 concentration mainly concentrated in the heating season, and the climax of PM10 concentration mainly concentrated in spring from March to June, when sand-dust storm happened frequently, N02 concentration throughout the year met the standard and the seasonal change was stable.%根据榆林城区环境空气质量监测数据,对2001～2010年间榆林城区空气质量污染特征和主要空气污染物的变化规律进行了分析.结果表明:2001 ～ 2010年间,榆林市城区的SO2、NO2和颗粒物污染总体呈下降趋势；2007 ～2010年间,SO2:和PM10的季节性污染特征较明显,SO2浓度高值主要集中在冬季采暖期,PM10浓度高值主要集中在春季沙尘常发期的3～6月,NO2浓度全年均无超标,季节性变化较稳定.
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