At wind speeds above that which causes the smallest to suspend, there will be a population of dust grains moving by a range of mechanisms: suspension, saltation and creep.A study from 2008 finds that the initial saltation of sand particles induces a static electric field by friction. Saltating sand acquires a negative charge relative to the ground which in turn loosens more sand particles which then begin saltating. This process has been found to double the number of particles predicted by previous theories.Particles become loosely held mainly due to a prolonged drought or arid conditions, and high wind speeds. Gust fronts may be produced by the outflow of rain-cooled air from an intense thunderstorm. Or, the wind gusts may be produced by a dry cold front: that is, a cold front that is moving into a dry air mass and is producing no precipitation—the type of dust storm which was common during the Dust Bowl years in the U.S. Following the passage of a dry cold front, convective instability resulting from cooler air riding over heated ground can maintain the dust storm initiated at the front. In desert areas, dust and sand storms are most commonly caused by either thunderstorm outflows, or by strong pressure gradients which cause an increase in wind velocity over a wide area. The vertical extent of the dust or sand that is raised is largely determined by the stability of the atmosphere above the ground as well as by the weight of the particulates.
In addition to the issue of lindane pollution, some concerns are related to the other isomers of HCH, namely alpha-HCH and beta-HCH, which are notably more toxic than lindane, lack its insecticidal properties, and are byproducts of lindane production. In the 1940s and 1950s, lindane producers stockpiled these isomers in open heaps, which led to ground and water contamination. The International HCH and Pesticide Forum has since been established to bring together experts to address the clean-up and containment of these sites. Modern manufacturing standards for lindane involve the treatment and conversion of waste isomers to less toxic industrial chemicals, a process known as "cracking". Today, only a few production plants remain active worldwide to accommodate public-health uses of lindane and declining agricultural needs. Lindane has not been manufactured in the U.S. since the mid-1970s, but continues to be imported. See also
Benzene hexachloride (disambiguation)

References
External links
Government and organizations
FDA Information on Lindane
EPA Information on Lindane
Gamma Hexachlorocyclohexane Fact Sheet
Agency for Toxics and Disease Registry: Toxicological Profile for Hexachlorocyclohexane
Lindane in the Pesticide Properties DataBase (PPDB)
World Health Organization Background Document on Lindane for Drinking-Water Quality Guidelines
Lindane Chemistry and Uses
World Health Organization: Lindane (EHC 124)
"Lindane Facts" - Website run by Morton Grove Pharmaceuticals
U.S. National Library of Medicine: Hazardous Substances Databank – Lindane

News stories and opinion articles
"Mom and Pros Tackle Lice" - NPR story from 2006
Pepsi and Coca-Cola - Lindane in drinks in India - news story from 2006
India - Pesticides in Coke & Pepsi drinks - news story from 2003