Character Of Individual Atmospheric Aerosol Particles In Shijiazhuang

In recent years, heavy atmospheric pollution in Shijiazhuang poses threats to our health and climate environment. In order to know the source of pollution and thoroughly, it is necessary to systematically study physicochemical property and pollution characteristics of atmospheric particulate matter in Shijiazhuang. The paper studies the annual atmospheric particulate matter in Shijiazhuang in detail by SEM/EDX. In addition, in order to evaluate the effect of temporary control measures, the paper also study the physicochemical property and pollution characteristics of atmospheric particulates during and after the APEC in 2014. According to the analysis of the 232 samples, the main conclusions in this paper are as follows:Atmospheric aerosol in Shijiazhuang are divided into eight categories,including mineral particles, tar ball, fly ash, soot aggregates, carbonaceous particles, metal oxide, water-soluble particles and other particles. The daily variation rate of atmospheric particulate matter in Shijiazhuang is greatly affected by meteorological conditions. In the four seasons, the order of the number of atmospheric particles, it goes: winter > autumn > spring > summer and the seasonal difference is obvious. The main pollutants in different seasons are different, and the corresponding primary sources of pollution are also different. Mineral particles accounting for more than one-third of the total particles are the main pollutants and dusty is the primary source of pollution in spring. Soot accounting for 37% of the total particles is the main pollutants and motor vehicle exhaust is the primary source of pollution in summer. Motor vehicle exhaust and coal are the main pollutants in winter and autumn. Motor vehicle exhaust has a serious effect on autumn, while coal-fired has greater effects on winter. The size of atmospheric particulates are mainly distributed in small size range. The particle size of less than 2.5μm accout for 85%. The absolute quantities of total particulate matter and various types of particulate matter are relatively small during the APEC meeting. After the meeting the number of tar ball, carbonaceous particles, water-soluble particles and S-rich particle increase 5.0 times, 4.4 times, 6.7 times and 10 times, respectively. It can be seen that temporary control measures is quite good.