烟花爆竹燃放对保定市大气污染特征影响研究

Study on the influence of fireworks on atmospheric pollution characteristics in Baoding

为了解烟花爆竹燃放对保定市大气污染特征的影响,于2018年春节期间对保定市不同监测站点PM_(2.5)中水溶性离子、有机碳(OC)、元素碳(EC)的污染特征进行了分析。结果表明:(1)春节期间保定市PM_(2.5)最大值为588μg/m^(3),水溶性离子浓度排序为NO^(-)_(3)>SO_(4)^(2-)>Cl^(-)>NH^(+)_(4)>K^(+)>Mg^(2+)>Na^(+)>Ca^(2+),PM_(2.5)的阴离子过剩电荷在0.06~2.26μmol/m^(3)波动,PM_(2.5)整体呈酸性;(2)监测期间PM_(2.5)中OC、EC的质量浓度分别为28.41、3.10μg/m^(3),OC与EC的相关系数高达0.9606,OC、EC主要来自一次污染源的排放;(3)后向轨迹模型计算表明,春节期间保定市受到西北方向和偏南方向气团传输的影响,PM_(2.5)污染是本地源排放和京津冀区域传输叠加的结果。

In order to study the influences of fireworks on atmospheric pollution characteristics in Baoding,this paper collected the online monitoring data of national control sites and provincial control sites during the 2018 Spring Festival,and analyzed the characteristic,sources and regional pollution transport of water-soluble ions,organic carbon(OC),elemental carbon(EC)in PM_(2.5).The results showed:(1)the PM_(2.5)of Baoding during monitoring period peaked at 588μg/m^(3),the concentration of water-soluble ions in PM_(2.5)followed the order of NO^(-)_(3)>SO_(4)^(2-)>Cl^(-)>NH^(+)_(4)>K^(+)>Mg^(2+)>Na^(+)>Ca^(2+),anion excess charge had a fluctuation range of 0.06-2.26μmol/m^(3),PM_(2.5)was generally acidic.(2)The mass concentrations of OC and EC in PM_(2.5)were 28.41,3.10μg/m^(3)respectively.The correlation coefficient between OC and EC was high(R 2=0.9606),the EC and OC were mainly came from the direct discharge of primary pollution source.(3)Backward trajectory model calculation showed that Baoding was affected by the northwest and southerly air mass transport during Spring Festival.The PM_(2.5)pollution was the results of superimposition of local source emissions and regional transport in Beijing-Tianjin-Hebei.