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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.
Dust storms usually occur when soil and air are dry, and 70% of dust storms occur in dry soil conditions. When dust storms occur, relative humidity averages 20â40% in Mongolia. An important outcome of this study is the trend of dusty days between 1960 and 1999.