Urban Aerosol Characteristics during the World Expo 2010in Shanghai Study on Urban Aerosol Characteristics during the 2010 Shanghai World Expo The the the the the the Distributions (10nm–10 μm) and the chemical compositions of the aerosols. Back-trajectories anda Lagrangian dispersion model were combined to analyze the transport characteristics of regional and local air pollution and the related mechanisms. Two classes of aerosols were identified and compared. Class I Particle counts in this class weredominated by particles in the size range 20–40 nm, and NH4+ was mainly presentin the form of (NH4)2SO4. A strong peak at noontime indicated that the particleformation Or growth process was promoted by the photochemical process. Class IIwas c The analysis showed increases in particle areas concentrations and total water soluble ions of about 17% and 350%, respectively,compared with Class I episodes. The fraction of particles in the size Range50–200 nm increased sharply to almost 50% of the total particle counts. Anexamination of the diurnal pattern and major water soluble ions suggested that the increase in size mode (50–200 nm) particles was mainly due to the particlegrowth NH4+was present in the form of (NH4)2SO4 and NH4NO3. Although air control measures during the World Expo abstractlimited local emissions, our results indicate that the regional transport fromsurrounding cities was responsible for the higher trace Gases and particlevolume concentrations, along with the large number of Aitken mode particles.
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Study on Urban Aerosol Characteristics during Shanghai World Expo