Minute solid or liquid particles suspended in air are called aerosols. Aerosols can be of natural origin, such as yellow sand, or of anthropogenic origin, such as railroad wear dust. Bulk analysis has been used for the chemical analysis of aerosols with such various sources. However, bulk analysis can only determine the average chemical composition of a group of particles and cannot, in principle, analyze the chemical composition of individual particles. In our group, we have developed an FIB-TOF-SIMS (Focused Ion Beam Time-of-Flight Secondary Ion Mass Spectrometer) to analyze the compositional distribution of individual particles . Our investigations have revealed that there is a certain correlation between particle composition (source) and particle shape. In addition, it is important to understand the composition and shape of particles originating from urban areas because the traffic volume is relatively high in urban areas and there is concern about the emission of large amounts of aerosols and their health effects on human health. In this study, we sampled aerosols in Shinjuku area and analyzed them using FIB-TOF-SIMS. In this presentation, we will report the component analysis of urban atmospheric aerosols and the shape characteristics of the particles
