In order to shed light on the problem of atmospheric particle pollution along roadsides in megacities areas, we carried out two-dimensional elemental analysis of roadside tree leaves using micro-PIXE, while morphological and elemental characterizations of the atmospheric particles retained on the leaf surface were analyzed using SEM-EDX. Samples were collected from roadside trees at the crossing and from background site trees. Elemental carbon agglomerated particles that adhered to the surface of roadside tree leaves were surmised to be primarilydiesel-exhaust particles. Cubic particles and agglomerated particles mainly composed of minerals such as Al and Si were thought to be road dust.

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