This paper discusses several approaches for obtaining the elemental and, in a few cases, inorganic compound identification in sized particles. The elemental analyses are done by wavelength dispersion x-ray fluorescence (WXRF). Fourier Transform infrared is being used for inorganic compound determination. The WXRF technique gives the best results for particles that are uniformly deposited on lightweight filter media. The standard impactors do not collect the particles in this manner and, therefore, some sample preparation or transfer is needed. The sample preparation and transfer techniques used in this research are also described. In addition, an in-stack impactor developed to collect the sized particles as a uniform deposit will be discussed. The results of the chemical analyses from sized particles collected from various types of industries will be presented.