Study on the aerosol characteristics in the different urban functional zones

It has become clear that aerosols play a more important role in most urban air pollution problems. The aerosol characteristics in the different urban functional zones of Nanjing has been observed and analyzed in autumn of 2009. The aerosol number concentration in each urban functional zone showed a close similarity and reached pretty high value, 10⁴ cm^-3. The number concentration and surface area concentration of spectrum distribution in study period showed two and three peaks, respectively. The particle scavenging efficiency was compared among rainfall, snowfall, and fog. The results showed that the effect of precipitation on the local aerosols dominated a major factor in clear, and fog impact on the diurnal variation of the aerosol number concentration significantly. The seasonal variations of aerosol were also discussed. The mass concentration varied significantly, autumn>; summer, while the fine particle quality percentage in autumn was higher than that in summer.