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Dust storm. A dust storm (or sandstorm in some contexts) is a meteorological phenomenon. Such a storm is usually the result of convection currents created by intense heating of the ground. Note: The above text is excerpted from the Wikipedia article Dust storm, which has been released under the GNU Free Documentation License.
Essentially, a combustible dust is any fine material that has the ability to catch fire and explode when mixed with air. Combustible dusts can be from: most solid organic materials (such as sugar, flour, grain, wood, etc.