Fugitive dust

Fugitive dust is an environmental air quality term for very small particles suspended in the air, primarily mineral dust that is sourced from the soil of Earth's pedosphere. A significant volume of fugitive dust that is visible from a distance is known as a dust cloud, and a large dust cloud driven by a gust front is known as a dust storm.

Fugitive dust particles are mainly minerals common to soil, including silicon oxides, aluminum oxides, calcium carbonates and iron oxides. About half of fugitive dust particles are larger than 10 microns in diameter and settle more quickly than the smaller particles.^[1] It does not include particulate matter from other common artificial sources such as vehicle exhaust, burn piles or smokestacks. The term is used to denote that the dust "escapes" into the atmosphere rather than being exhausted in a "confined flow stream" from a "ducted emitter" (an exhaust pipe or chimney).^[2]

The U.S. Environmental Protection Agency estimated that fugitive dust was responsible for 92% of the PM-10 emissions in the United States in 1995. ^[3]

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