Individual particle characterization of airborne inhalable particulate matter (PM_(10)) in Zhengzhou

The pollution characteristic of airborne inhalable particulate matter(PM10) in Zhengzhou in 2005 was analyzed.By means of high resolution field emission scanning electron microcopy(FESEM) and image analysis technology(IA),the individual particle morphology and their size distribution of particle number and volume of Summer PM10 in Zhengzhou were investigated.The results show that Zhengzhou has a prominent pollution of PM10 in 2005;the pollution in spring is the most serious,followed by winter,autumn and summer.Soot aggregates and irregular mineral particles are dominant in number of summer PM10 in Zhengzhou.The peak of particle number distribution by the equivalent sphere diameter occurs in 0.1～0.2μm,and the peak of particle volume distribution by the equivalent sphere diameter occur in 0.7～0.8μm and 1~2.5μm.These results show that the fine particles are prevailing in summer PM10 in Zhengzhou and the coarse particles contribute less in number and more in total volume(total mass).