11

Most dust storms occur down-wind from areas with a lack of moisture, little vegetation, and high soil content. Vegetative roots help to keep the soil intact when there is a lack of moisture. So any shift in the future that leads to a net decrease in vegetation, net decrease in precipitation, or an increase in exposed soil content will increase dust storm ...


9

Particle size is the key issue. Saharan loess (wind-blown dust) must have a small enough particle size that it can be lofted by ordinary wind speeds: typically, it is in the 20-50μm size range. Particle sizes lofted into the upper atmosphere during explosive volcanic eruptions can be much higher: "The explosive ash was bimodal in size distribution with ...


3

The first thing to consider is, if it is not the adjacent coal mine, what other nearby sources could produce such a result. Is there a coal fired power station or a factory nearby. If there are no other likely sources then the coal mine is still the most likely candidate as the source of the dust and metal contaminants. The other thing to consider is how is ...


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