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This is a scanning electron microscope (SEM) image of soil dust, composed mainly of silicon-oxygen minerals. This particle was collected along a highway in Scottsdale, Arizona, as part of a research study conducted by Arizona State University researchers on the flow of air pollution in the Phoenix metro area.
Dust kicked up by road traffic creates a large proportion of the particles, while others are the combustion products of gasoline or diesel fuel, sometimes in combination with dust.Image credit: Hua Xin, Ph.D., Arizona State University
