Distribution Characteristics of Atmospheric Aerosol During a Heavy Pollution Weather Process in Winter in Urban Shijiazhuang Based on Scanning Mobility Particle Spectrometer

Based on Scanning Mobility Particle Spectrometer (SMPS, Model 3938, USA) and meteorological observational equipment, the atmospheric aerosol particles (10~1000 nm in diameter) during a heavy pollution weather process on January 9~15, 2019 in urban Shijiazhuang was observed and analyzed. The results show that the variation tendencies of PM2.5 concentration, AQI and aerosol particle concentration in Shijiazhuang were consistent during that process. During the heavy pollution weather, the maximum aerosol particle concentration was 71,500 cm−3, and the aerosol was mainly composed of fine-scale particles with average diameter of 80~220 nm. The high concentration of fine aerosol results in the severe pollution and poor visibility. Affected by human activities, the concentration was relatively higher during the daytime and lower at night. The stable weather condition is a vital factor to maintain the pollution process that the increase of humidity leads to the increase of aerosol concentration and the decrease of visibility.