TWO YEAR STUDY OF ELEMENTAL COMPOSITION OF ATMOSPHERIC AEROSOLS IN MEXICO CITY

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Abstract
As the second part of a wide project, we have carried out a study of airborne particulates in Mexico City, collected during two time periods (from 7:00 to 11:00, and from 11:00 to 15:00 Hrs.), one day of every week between March 1988 and February 1990. Elemental concentrations were determined by Proton Induced X-ray Emission (PIXE) for elements Na to Pb, while soot content was measured by means of Laser Integrating Plate Method (LIPM). As expected, the concentrations show an increase during the months October to March, due to frequent thermal inversions and dry weather. Moreover, the pollutant levels are higher during earlier hours, while the soil and anthropogenic origin of the elements can be better determined for the mid-day period, as seen from the grouping in the respective dendograms.

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