Major inorganic compositions in fine and coarse particles of ambient aerosol at Qingdao

Four times measurements of ambient aerosol were conducted from September, 1997 to August, 1998 at a coastal site of Qingdao. The results indicated that mass concentrations of aerosol mainly exist in fine particles(PM2.5, diameter less than 2.5??m). the proportion of the fine particles in the heating period is much higher than that in the non-heating period. SO42-, NH4+, NO3-, K+ mainly exist in the fine particles while Na+, Cl-, Mg2+, Ca2+ mainly exist in the coarse particle, F-, Cl-, Br- mainly exist in the fine particles in the winter, but in the coarse particles in the summer, which reflects the influence of anthropogenic burning source and atmosphere temperature.EI0535-372