Abstract
The composition of four samples of atmospheric coarse particles (> 6 μm diameter) was determined by morphology using an optical microscope. Two samples were from a rural site and two from an urban site in the midwestern United States. The urban samples represented a heavily industrial sector and a commercial sector of the urban area. The contributions of various sources to total mass concentration were compared. Results indicate that limestone and silicates were the main source of material at the non-urban site. Anthropogenic sources, represented by flyash and coal, were present in the industrial sector sample and rubber tire was present in the commercial sector sample. The mass median diameters (MMD) for different components were as follows: limestone (20 μm), silicates (12 μm), coal, flyash and iron oxide (12 μm) and rubber tire (25 μm).
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