The Size of Particulate Trace Elements in the Atmosphere—A Review

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Abstract
Size distributions of 38 trace elements reported in the literature over the past two decades have been summarized. Those elements with aerodynamic mass median diameter less than 2 μm generally have bimodal distributions: the dominant peak occurs in the range 0.5-1 μm, with a smaller peak at about 3-5 μm. Elements with larger mass median diameter have a single peak, with relatively little mass below 1 μm. Overall, the individual distributions of many of the elements are surprisingly consistent, despite different sampling locations, time periods, and experimental methods.

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