Characteristics Of Atmospheric Particle Pollution In Three Cities Of Southern Jiangsu

With high temporal resolution monitoring instruments, the more developed areas of the three economic monitoring of atmospheric particulate matter, its spatial and temporal characteristics were studied, the results showed that:the three cities in southern Jiangsu atmospheric particulate matter pollution is serious in2012, the degree of pollution: Nanjing>Changzhou>Suzhou, the mass concentration of the pollutant by the sources of pollution and the impact of seasonal variations, particulate matter fine particles; Nanjing and Suzhou during the Spring Festival, the Lantern Festival because of the large number of fireworks and firecrackers cause the concentration of respirable particulate matter mainly fine particulate matter, mainly because of the differences in the two human activities and weather conditions, the mass concentration distribution characteristics of different. Dust transit Nanjing atmospheric respirable mass concentration of particulate matter in a significant increase in coarse particles contribute significantly;In2011autumn and winter distribution and sources of PM2.5and its water-soluble ions and elements of the three cities in southern Jiangsu, the results showed that:the three cities in southern Jiangsu severe fine particle pollution in autumn and winter2011, which is the most heavily polluted Suzhou, Changzhou, followed by Nanjing light, water-soluble anionic in sulfate and nitrate-based cations calcium and magnesium ions mainly fine particles in secondary aerosol, the main elements of the fine particles of the three cities in southern Jiangsu calcium, followed by aluminum, Nanjing during the sampling period by straw burning, potassium increased significantly influenced by multiple sources of pollution, fine particles of the three cities in southern Jiangsu, Nanjing is mainly affected by biomass burning, surface dust, diesel combustion; Changzhou mainly affected by the surface dust, biomass burning, metal industry, automobile exhaust emissions; Suzhou is mainly affected by the surface dust, biomass burning, hardware industrial, automotive exhaust;In January2013Nanjing a persistent haze days in the chemical composition of atmospheric particulate matter distribution characteristics, the results show that:the persistent fog and haze occurred in Nanjing in January2013, during the Nanjing visibility majority of5km, and the wind speed is smaller, obvious precipitation, weak cold air, stable atmospheric stratification, is not conducive to the spread of pollutants, particulate matter mass concentration was significantly higher daily average concentration of PM2.5and PM10exceeded the national secondary standard, exceeded the rate of100%particles to fine particles; during the haze of the fog, fine particulate matter on the visibility of the most significant forward, and when RH>80%when visibility are about2km, Description visibility not only by the impact of the concentration of fine particulate matter, also with relatively humidity are closely related, when RH>80%, SO42-and NH4+and visibility of the correlation best, the value of R2, respectively, to0.57and0.71illustrate the NH4+, SO42-occurrence of phase change, due to its hygroscopic growth lead to decreased visibility; during secondary pollutants, airborne fine particles higher proportion of nitrate, sulfate and ammonium mass concentration of the spectral distribution of the spectrum was consistent with the particulate matter mass concentration, the highest value on January13, mainly concentrated in the ultra-fine particles. The haze days is mainly affected by the impact of mobile sources.