Abstract
Levels of particulate matter and trace elements in the atmosphere of Natal (Brazil) were acquired during a campaign performed between September of 1995 and April of 1996. Airborne particulate matter was collected during 24-hour periods onto Millipore 47-mm diameter filters for ten consecutive days at 14 stationary monitoring sites located in the downtown area of Natal or along the most important avenues. The particulate concentration was determined using pre- and post-sampling filter weights, whereas elemental concentrations were assessed by an X-ray fluorescence spectroscopy system. Concentrations of both particulate matter and trace elements (Fe, Zn) were not uniform but varied spatially exhibiting highest values in the leeward roads. The results of this survey suggest that levels of urban pollution in Natal are lower than levels observed in the Brazilian cities of Rio de Janeiro and Sâo Paulo.
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