What is smog? Detailed answer

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What is smog? Detailed answer

Big encyclopedia for children and adults

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What is smog?

In England, significant efforts have been made to control smoke, especially from domestic boilers and factory chimneys. In some areas, coal-fired boilers are prohibited.

In some cities, a mixture of various industrial gases released into the atmosphere forms a mist, which is called "smog". When it enters the lungs, it causes coughing. In the presence of individual gases and tiny particles in the smog, such smog becomes poisonous.

So, dust is always present in the air. Dust is the smallest particles that are suspended in the air. Dust is formed during soil erosion, during volcanic eruptions, from exhaust gases and industrial waste. The latter can be observed when looking at the smoking factory chimneys.

It is difficult to imagine the amount of dust in the air. It is believed that annually over the territory of the United States is about 39 tons of dust! 000 tons of this mass is dust from natural sources, therefore, about 000 tons of dust is the result of human activity!

Naturally, most of the dust in industrial cities. For example, this is how much dust settles on every square kilometer in major US cities: Detroit - 65 tons, New York - 55 tons, Chicago - 55 tons, Pittsburgh - 42 tons, Los Angeles - 30 tons. In a city with a large number of industrial enterprises, up to 180 tons of dust can fall monthly.

This is a very serious problem for human health, so many cities are taking active measures to reduce air pollution. Equipment that emits a lot of dust is equipped with dust collectors. Ventilation systems and electrical appliances are also used. In some cases, wet drilling and water spraying are used. However, the problem of dangerous air pollution - the problem of smog - has not yet been solved.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Why do swifts build nests under a canopy?

The attitude of swifts to the arrangement of their nests can hardly be described otherwise than as "disregard". How else to call the manner of construction, in which the main building material is one's own saliva, which quickly hardens in the air?

Swifts are the best flyers among birds. They live on the fly - they catch and swallow insects, quench their thirst, make dates, play weddings, relax, sleep. In the same place, in the air, they catch flying cobwebs, plant fluff, small feathers. All this is abundantly mixed with saliva and in this form is used as a building material. Swift nests are always located very high - so that they can fly up to them without interference.

Swift saliva, unlike real cement, softens and even partially dissolves in water, so almost all species of these birds nest in closed places - tree hollows, caves, grottoes - or, at least, under canopies that exclude moisture from entering nests.

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