2006～2010年大连市区空气质量变化原因分析

Analysis of the variation and affecting factor of air quality in Dalian ambience from 2006 to 2010

2006～2010年,大连市区空气中可吸入颗粒物和二氧化硫浓度总体呈下降趋势,可吸入颗粒物浓度从0.094mg/m3,下降到0.058mg/m3,二氧化硫浓度从0.048mg/m3,下降到0.037mg/m3.原因首先是由于大连的污染减排取得了明显的成效,截止2010年底,8家电厂的脱硫工程全面完工;其次是由于全国范围的污染减排,使大环境变好,冬季受北部城市外来污染的影响下降,夏季来自山东半岛的污染也下降,即外来污染对大连的影响下降.大连市空气中二氧化氮浓度升高,其原因一是由于汽车尾气排放量的不断上升,二是由于电厂以及工业企业的污染减排缺少脱氮工艺;此外,大连市采暖期二氧化硫的污染主要是受冬季采暖燃煤的影响.

Data of PM10 and SO2 in Dalian urban are collected and analyzed from 2006 to 2010,the result shows that the level of PM10 and SO2 were decreasing respectively.The level of PM10 varied from 0.094mg/m3 to 0.058 mg/m3,the level of SO2 varied from 0.048 mg/m3 to 0.037 mg/m3.The decline tendency proves that the local government＇s measurement has taken good effect in reducing discharge of air pollutant.By the end of 2010,the desulfur project of 8 power plants had been finished.The reducing discharge of air pollutant in the cities around Dalian also contribute to the decline tendency.However,the concentration of NO2 in Dalian urban was increasing during this period,one reason was the increase of vehicle exhaust,another was the lack of denitrogen measurement in power plants and factories.Furthermore,the level of SO2 in winter heating was impacted by burning coal.