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Particle concentrations of metallic elements in ambient air were determined using a micro-orifice uniform deposition impactor (MOUDI). Comparisons were also made of particle concentrations of various sizes (PM(subscript 18)^+, PM(subscript 18-10), PM(subscript 10-2.5), and PM(subscript 2.5-1)) sampled at Westin Park and at Gung-Ming Junior High School (Taichung airport). Comparing the particle sizes of PM(subscript 18)^+, PM(subscript 18-10), and PM(subscript 10-2.5) revealed higher concentrations in Westin Park than those in Gung-Ming Junior High School (Taichung airport). The only exception was PM(subscript 2.5-1), indicating higher concentrations at the Gung-Ming site. The average particle concentrations order was Gung-Ming Junior High School (Taichung airport)  Westin Park for the particle size of PM(subscript 2.5-1). According to analysis results of various particle sizes of metallic elements Zn, Ni, Cu, Cd and Pb in the ambient air, the relative concentrations were PM(subscript 18)^+  PM(subscript 18-10)  PM(subscript 2.5-1)  PM(subscript 10-2.5) for all sampling sites. The only exception was particle-bound mercury Hg(p), likely owing to the proximity of the Taichung airport to the Taiwan Strait (approximately 11.6 km). Moreover, Dragon Steel Plant, Han-Shian Aerospace Industrial Development Corporation and Quan-Lien Industrial Park were located nearby.

The Size Distributions of Ambient Air Metallic Pollutants by Using a Multi-Stage MOUDI Sampler