近年来，伴随着经济的飞速发展，长三角等地空气污染也日趋严重。然而，目前对于该区域大气污染物污染机制等的研究还有较大不足。本项目依托江苏省大气环境监测与污染控制高技术研究重点实验室，以南京为典型城市，首次使用目前世界上较为先进的Aerodyne公司研制的黒碳（Soot particle） -气溶胶质谱仪（SP-AMS），对该地区亚微米细颗粒物（PM1）的污染情况进行研究。本项目拟选择夏冬两季的灰霾频发期进行两次外场观测，同步在线采集霾天及非霾天中PM1浓度、成分、粒径等数据，通过对所得数据进行分析及源解析，深入了解该地区PM1浓度水平、变化规律、来源与贡献、大气转化机制，及其霾天非霾天区别等，为该地区空气污染治理的方向和政策制定提供科学翔实的数据支撑。这些结果还可加深我们对于气溶胶污染机理与化学演变过程的科学认知，具有重要的科学意义。

Recently, air pollution in Yangtze River Delta becomes increasingly severe along with the rapid development of economy, yet our current understanding on behaviors/characteristics of the atmospheric pollutants in this region is very limited. This project will utilize an advanced soot particle - aerosol mass spectrometer (SP-AMS), which was developed very recently by Aerodyne Research Inc., for the first time, to characterize the atmospheric submicron aerosols (PM1) in Nanjing area. This instrument is able to simultaneously measure the concentrations, chemical compositions and size distributions of ambient fine particles in real-time and in a fine time resolution (a few seconds to minutes). The instrument will be deployed in Nanjing City both in summer and winter seasons, with each field campaign lasting about one month and covering both hazy and non-hazy days. In-depth analyses and source apportionment of the aerosol mass spectral data will enable us to understand more thoroughly the characteristics of PM1 in this region, including concentration levels, emission sources and contributions, atmospheric transformation processes, seasonal variations and compositional differences between hazy and non-hazy days, etc. These results will have great implications for the government and industry to implement effective control measures to reduce the atmospheric pollution in this region. Our findings are also important in understanding the formation mechanisms and aging processes of fine aerosol particles in the atmosphere.