This paper presents the first measurement of the elemental composition of the suspended particulate matter in the atmosphere
of Londrina city (Paraná State, Brazil). The sampling was accomplished in the summer of 2003 and in the winter of 2002, with
a stacker filter holder, collecting simultaneously the fine particulates (PM2.5) and the coarse particulates (PM10). The concentration of K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Br and Pb associated with particulate matter was determined
by energy dispersive X-ray fluorescence. The results of the grouping analysis suggested that the elements in the aerosol particles
came from two sources: soil re-suspension and industrial or anthropogenic activities.