四川省城市环境空气质量及变化趋势

本文根据2000～2009年四川省24个地级城市例行空气监测数据,按照《环境空气质量标准》(GB3095-1996)中的二级标准,采用综合污染指数法分析了四川省近10年环境空气质量的现状、变化趋势及影响因素。结果表明:从年际变化看,可吸入颗粒物浓度呈下降趋势,二氧化硫、二氧化氮浓度变化较平稳;年内变化显示,各污染物浓度季节变化明显,冬季污染最严重,污染程度由高到低的顺序为冬季、春季、秋季、夏季。全省综合污染指数呈下降趋势,空气污染程度得到了明显缓解,空气质量逐渐变好。

The Ambient Air Quality and Trends in Cities of Sichuan Province

Based on the routine air monitoring data of 24 cities of Sichuan Province in recent decade,according to the standard of level Ⅱin the Ambient Air Quality Standards（GB3095-1996）,the air quality status,trends and influencing factors during 2000～2009 were analyzed adopting the method of comprehensive pollution index.The result showed that,Inhalable Particle concentration decreased year by year,the concentrations of SO2 and NO2 were stable.Each pollutant concentration appeared seasonal change significantly.The most serious pollution happened in winter.The pollution levels from high to low were in sequence as winter,spring,autumn,and summer.The comprehensive pollution index declined yearly.The air pollution had significant alleviated,and the air quality was gradually becoming better.