Pollution Characteristics Of Atmospheric Particulates In Hefei City

In recent years, atmospheric particulate matter pollution has become one of theatmospheric environment hot issues.This article makes the atmospheric particulatematter PM2.5and PM10as an object from Heifei three seasons in autumn and winter,summer2013. It is measured and analyzed that the mass concentration of PM2.5andPM10pollution characteristics, the particulate matter and PAHs element distributioncharacteristics to provide a scientific theory to Hefei’s atmospheric pollutionprevention planning and environment control. This article has following conclusions:(1) The concentration of Hefei’s atmosphere particulate matters are difference whenin different seasons as well as vary samplingpoints. The average of concentration onPM2.5and PM10in Hefei’s season shows that autumn larger than winter more thansummer. In autumn the average concentration between PM2.5and PM10are beyondour national New Ⅱstandard1.73and1.427times.(2) PM2.5and PM10concentrations correlation coefficient R2is in the range of0.543~0.947.It is indicated that PM10and PM2.5has significant correlation. Thecorrelation coefficient in concentrations of particulate matter and meteorologicalfactors shows that PM2.5and PM10concentrations has correlation in temperature,pressure and visibility, but not significant correlation.It not showing that theconcentrations of PM2.5and PM10has a certain correlation between humidity andwind speed.(3) The different elements of same particulate matter in summer and autumn season,the concentration are huge difference.In autumn PM2.5and PM10elements totalconcentrations are higher than summer.Judging by the Si reach maximum and theratio Al/Ca we know that the source of pollution is from construction raise dust.Enrichment factor study shows that Ca, Mg are mainly from anthropogenic sources,other elements have small influence on it,it comes from soil dust.(4) The concentration of PAHs in PM2.5and PM10have obvious seasonal variationcharacteristics. winter larger than autumn more than summer. The largestconcentration of PAHs monomer in the autumn summer is benzo (b) fluoranthene.PAHs features for source identification ratios indicates that contamination of PAHs inthe autumn winter season in Hefei city,almost from local sources pollution,it mainlyfrom the mixing of coal-fired and communication pollution.