西安大气SO_2/NO_x污染时空变化的分析

依据SO2和NOX监测数据,分析了近10年来西安大气污染时空变化,结果发现:①SO2、NOX的年内变化呈宽“U”字型,冬季1-2月和11-12月污染较为严重,夏半年4-9月浓度低,与月平均气温变化具有较好的反相关性;②12年来SO2、NO的年际变化呈明显的下降趋势,从1999年开始的“煤改气工程”收到了明显的环保效益,一、四季度SO2和NO的年际变化基本符合环境库茨聂兹曲线;③1996年以来,大气SO2和NO呈现明显的时空转化特征,工业区SO2、NO浓度大幅度下降,商业区和居住区的污染反而高于工业区,这反应了近年来产业结构调整、能源结构改变和区域发展速度的差异,应引起环保部门重视。

Analysis on Temporal and Spatial Changes of SO2/NOx in Xi'an City During 1991-2002

According to monitored data of SO_2 and NO_x in Xi'an City during 1991-2002,the space-time variation was analyzed.The results were follow: ① Within a year the curve of concentration change of SO_2and NO_x form a "U" figure.In winter from January to February and from November to December the concentration were higher,while in the summery from April to May the concentration were relatively lower,and it had higher relativity with change of average air temperature;② The quarter concentration of so_2and NO_X declined obviously in recent 12 years,it contribute to project of coal being changed into gas from 1999.And the trend answered for environment Kuznets curve;③ There was a obvious rule about district change of SO_2and NO_x in recent 6 years.That was concentration of SO_2and NO_x declined gradually in industrial estate,while in shopping center and habitation area it was higher than in industrial estate.it showed that there were differences in regulating domain configuration,changing energy sources configuration,tempo of areas.