沈阳市冬季一次典型大气污染过程特征和成因分析

摘要

One typical air pollution took place from November 18 to 25 of 2013. On the basis of meteorological conditions and air quality monitoring data analysis, single particles aerosol mass spectrometer (SPAMS) was used to analyze the causes of such pollution and characteristics of PM . The results showed that the meteorological conditions unfavorable for air diffusion were the 2.5 main cause and accumulation of low emission might be another key factor for such heavy air pollution. From the perspective of PM 2.5 composition, organic carbon proportion increased dramatically. Organic pollution was serious, and mixing of particles was intensified with the aggravation of air pollution. From the perspective of pollution source, vehicle exhaust, industrial emission and coal combustion accounted for the major proportion.%2013年11月18日~25日沈阳地区出现一次典型空气污染过程。采用单颗粒气溶胶质谱仪（SPAMS），并结合气象条件分析了该次污染的成因和细颗粒物的污染特征。结果表明，不利于污染物扩散的气象条件是重污染发生的主要原因，低空排放的积累可能是造成这次污染的又一重要原因。从细颗粒物成分上看，污染过程中有机碳颗粒占比明显增加，有机物污染较为严重，颗粒物间混合加剧；从来源上看，机动车尾气、工业排放和燃煤的占比较高。