Dust Hakida Referat

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Domestic dust on a finger are present indoors wherever humans live. Positive tests for dust mite allergies are extremely common among people with asthma. Dust mites are microscopic whose primary food is dead human skin cells, but they do not live on living people.

They and their feces and other which they produce are major constituents of house dust, but because they are so heavy they are not suspended for long in the air. They are generally found on the floor and other surfaces until disturbed (by walking, for example). It could take somewhere between twenty minutes and two hours for dust mites to settle back down out of the air. Dust mites are a nesting species that prefers a dark, warm, and humid climate.

They flourish in mattresses, bedding, upholstered furniture,. Their feces include enzymes that are released upon contact with a moist surface, which can happen when a person inhales, and these enzymes can kill cells within the human body. House dust mites did not become a problem until humans began to use textiles, such as western style blankets and clothing. Large dust storm over Atmospheric or wind-borne, also known as aeolian dust, comes from arid and dry regions where high velocity winds are able to remove mostly silt-sized material, deflating susceptible surfaces. This includes areas where grazing, ploughing, vehicle use, and other human activities have further destabilized the land, though not all source areas have been largely affected. One-third of the global land area is covered by dust-producing surfaces, made up of like the which covers 0.9 billion hectares, and which occupy 5.2 billion hectares.

Dust in the atmosphere is produced by and sandblasting of sand-sized grains, and it is transported through the. This airborne dust is considered an and once in the atmosphere, it can produce strong local. Saharan dust in particular can be transported and deposited as far as the and the, and may affect air temperatures, cause, and alter rainfall amounts. Middle East Dust in the has been a historic phenomenon. Recently, because of and the escalating process of, the problem has worsened dramatically. As a multi-factor phenomenon, there is not yet a clear consensus on the sources or potential solutions to the problem. In, the dust is already affecting more than 5 million people directly, and has emerged as a serious government issue in recent years.

In the province of it has led to the severe reduction of. The amount of pollutants in the air has surpassed more than 50 times the normal level several times in a year. Recently, initiatives such as Project-Dust have been established to directly study the Middle Eastern dust.