石家庄市大气污染现状及污染特征分析

为摸清石家庄市大气污染现状及特征,对石家庄市2002—2011年的空气质量自动监测数据进行分析。研究结果表明,石家庄的空气质量总体呈好转趋势,优良天数逐年增长,大气中3项主要污染物浓度连续2年均达到国家二级标准,PM10,SO2年均浓度呈显著下降,NO2年均浓度则呈上升趋势。污染物日变化各季节大致相同,其时空分布不均匀,SO2与PM10夏季浓度较低,春冬季较高,表现出明显的季节性特征;NO2季节性特征不显著。

Air pollution status and characteristics of Shijiazhuang City

Air quality data of Shijiazhuang City from 2002 to 2011 is analyzed to find out the air pollution situation and characteristics.The results show that,Shijiazhuang's air quality is integrally improved.Days of fairly good air quality grows year by year,the concentrations of three main pollutants meets in atmosphere the national secondary standard for consecutively two years,and the annual average concentrations of PM10 and SO2 decrease,while that of NO2 increase.The diurnal variation of each pollutant in each season is roughly the same,but its spatial and temporal distribution is uneven,for SO2 and PM10 concentrations are lower in summer while higher in spring and winter,showing obvious seasonal characteristics.But NO2 has no apparently seasonal characteristics.