Abstract
It is well known that green roof systems are being used to improve the environment by reducing the summer temperatures inside the houses and to capture atmospheric contaminants. The Universidad Autónoma de Chapingo had begun a project to test the latter possibility in Mexico City, were some roofs were covered with the plant Sedum praealtum L. By PIXE analysis, metal concentrations were determined in ashes of the leaves and stems. The concentrations were compared with those of the substrata and plantations grown in a greenhouse, which were used as a reference. Preliminary results are presented.
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