德州市冬季大气PM_(2.5)污染特征及成因分析

Analysis on the Characteristics and Causes of Winter Atmospheric PM2.5Pollution in Dezhou City

德州市属于京津冀大气污染传输通道“2+26”城市,是京津冀南部重要生态功能区。为了明确德州市冬季大气细颗粒物(PM_(2.5))污染特征及成因,本文采用德州市德城区省控大气监测站点2019年1月6日到16日的监测数据,结合中国大气成分近实时追踪数据集(TAP),分析PM_(2.5)中的3种无机离子浓度(SO_(4)^(2-)、NO_(3)^(-)、NH_(4)^(+))。结果表明,德州市冬季PM_(2.5)污染事件属于硝酸型污染,PM_(2.5)中NO_(3)^(-)、SO_(4)^(2-)、NH_(4)^(+)三种组分浓度的相对比例分别为43.0%、28.5%、28.5%。因此,要想缓解大气污染,德州市必须进一步加强对硝酸盐气溶胶前体物的排放控制。

Dezhou City belongs to the "2+26" cities of the Beijing-Tianjin-Hebei atmospheric pollution transmission channel,and is an important ecological functional area in the south of Beijing-Tianjin-Hebei.In order to clarify the characteristics and causes of winter atmospheric fine particulate matter(PM_(2.5)) pollution in Dezhou City,this paper uses monitoring data from the provincial controlled atmospheric monitoring station in Decheng District,Dezhou City from January 6 to 16,2019,combined with the Tracking Air Pollution in China(TAP),to analyze the concentrations of three inorganic ions(SO_4~(2-),NO_3~-,NH_4~+) in PM_(2.5).The results show that the winter PM_(2.5) pollution event in Dezhou City belongs to nitric acid type pollution,and the relative ratios of NO_3~-,SO_4~(2-),and NH_4~+ concentrations in PM_(2.5) are 43.0%,28.5%,and 28.5%,respectively.Therefore,in order to alleviate air pollution,Dezhou City must further strengthen the emission control of nitrate aerosol precursors.