区域秋冬季污染特征及PM2.5源解析

Regional autumn and winter pollution characteristics and PM2.5 source analysis

兴平市作为咸阳市污染最严重的地区之一,秋冬季污染特征明显。利用单颗粒气溶胶飞行时间质谱仪(SPAMS)对2019~2020年秋冬季PM2.5组分快速分析,为不同污染过程提供科学有效的应对方法。结果表明:(1)有机碳、富钾和左旋葡聚糖在颗粒物成分分类和百分比含量上占比处于前三位,与PM2.5变化趋势相对较为吻合,因此化石燃料不完全燃烧、生物质燃烧、机动车尾气源是主要污染源;(2)PM2.5源解析显示主要受机动车尾气源(21.4%)、燃煤源(17.0%)、二次无机源(16.9%)、生物质燃烧源(13.2%)等的影响。

Xingping City,as one of the most seriously polluted areas in Xianyang City, has obvious pollution characteristics in autumn and winter.Rapid analysis of PM2.5 components in autumn and winter 2019~2020 using a single-particle aerosol time-of-fl ight mass spectrometer(SPAMS) to provide an effective scientific response to different pollution processes.The results show:(1)organic carbon, potassium-rich and levodextran are in the top three in the composition classification and percentage of particulate matter content,which is relatively consistent with the change trend of PM2.5. Therefore, incomplete combustion of fossil fuels, biomass combustion and motor vehicle exhaust sources are the main pollution sources;(2)PM2.5 source analysis shows that it is mainly affected by motor vehicle exhaust source(21.4%), coal source(17.0%), secondary inorganic source(16.9%), biomass combustion source(13.2%), etc.