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Aerosol samples collected in three characteristic Chilean cities-including urban and remote zones-have been analyzed by the PIXE spectroscopic technique. Elemental composition, total suspended particulate matter (TSP), particle size distribution, and the peculiar geographic and meteorological parameters have been included in this study. Santiago--the polluted capital of Chile--registered high TSP indexes and important amounts of hazardous elements in air such as S, V, Cr, Zn, Br and Pb. The atmosphere of Antofagasta city showed marine and mineral activity influence. Results from Chillán city are similar to those from rural environments. Protons and deuterons-provided by the isochronous cyclotron of the University of Chile-were used to excite X-ray radiation from the sample. Signals were processed by an energy dispersive detection system, including a cryogenic Si(Li) detector, electronic for pulse amplification and an analog to digital converter. The absolute elemental concentration of the particulate matter in air was obtained through a fundamental parameter equation. Samples consist of particulate material collected directly on Nuclepore filters or deposited over Kapton foils. Typical elements analyzed were Mg, Al, Si, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Cu, Zn, As, Br and Pb.