What is dust? Detailed answer

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What is dust? Detailed answer

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What is dust?

Dust is formed by tiny solid particles suspended in the air. Dust, as a rule, is lifted from the ground by the wind, then is carried in the air under the influence of air currents, until it again settles on the surface under the influence of gravity or along with rain and snow.

Dust sources can be very different. It appears as a result of soil weathering, is ejected from the craters of volcanoes during eruptions, is found in the exhaust gases of cars and other vehicles, and even in ocean spray. Perhaps the last of these sources - the ocean - will seem doubtful to you. Indeed, how can ocean water serve as a source of dust?

However, did you know that every year 2 tons of various salts enter the earth's atmosphere from the ocean? Water, evaporating, turns into water vapor, and the chemical elements contained in ocean salt remain in the air. Surely each of you heard the expression dust storm. It occurs in areas where natural vegetation has died due to drought. During such a storm, thousands of tons of dust rise into the air and are transported to a distance of up to 000 km, or even more!

For example, during a dust storm that raged in the southwestern United States in 1933, about 10 tons of dust fell per square kilometer in New England (the northeastern region of the United States). The dust that rose as a result of a storm in the great African Sahara desert flew to London and other European cities! In general, the atmosphere constantly contains a huge amount of dust. Approximately 43 tons of dust are deposited on the United States every year, and of these, approximately 000 tons are due to human activity.

Air pollution by dust is one of the causes of mud clouds - smog - hanging over major cities. Currently, in all developed countries there are special systems to combat this evil that damages human health and the environment.

Author: Likum A.

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