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The determinations of PST and PM 1 0 were performed in ten stations, distributed of north to the south, covering urban and rural zones with the municipalities of: Girardota, Bello, Medellin, Itagui, Sabaneta and Caldas. In the Aburra's valley, nor-western region of Colombia, inhabited by 3 million people, crossed by 400,000 vehicles with the presence of establishments of industrial sectors: textile, foods and metal-mechanical The concentrations of total suspended particles (PST) and breathable particles (PM 1 0) were evaluated, during the period: December of 2000 to June of 2001. Saldarriaga Molina, Julio Cesar Echeverri Londono, Carlos Alberto Molina Perez Francisco Jose International Nuclear Information System (INIS) Total suspended particles (TSP) and breathable particles (PM10) in Aburra Valley, Colombia
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