Question

what is smog. What are its kinds. Explain. ​

Answer 1

Smog is a type of air pollution, which is a mixture of smoke and fog in the air (smoke + fog = smog). Smog is formed when ash, sulphur and other harmful chemicals present in the smoke emitted by factories, vehicles, zoom farming, burning of coal and industrial plants, are exposed to the fog. This leads to many diseases caused by air pollution.

Smog contains a harmful mixture of fog, dust and air pollutants such as nitrogen oxides, sulphur dioxide, volatile organic compounds etc. Together, they make a dense layer of ground-level ozone.

Types of smog

Sulphur smog

This is produced when there is high amount of sulphur oxide in the air due to the use of sulphur-bearing coal and petroleum substances.

Photochemical smog

In cities, after emitted by automobiles and other sources, nitrogen oxides and hydrocarbons pass through photochemical reactions in the lower atmosphere. The result is photochemical smog.

Industrial smog

This gray-air smog is produced from the incomplete combustion of petroleum oil or coal, which contains mercury and sulphur oxide.

Both industrial smog and photochemical smog appear to the eye as yellow-brown haze, but there is considerable difference between the two. Industrial smog is basically found in urban areas where burning of fossil fuels creates smoke and sulphur dioxide that get mixed with fog to create a thick smog. Photochemical smog is formed due to fossil fuels, and the burning of trees and organic waste. These emissions combine in the presence of sunlight to produce nitrogen oxides and volatile organic compounds that create a dense haze. The thickness of these particles is about 2.5 micrometre. Due to their small size, they enter the lungs with respiration and can later damage the heart.

Answer 2

Smog. Smog is a kind of air pollution, originally named for the mixture of smoke and fog in the air. Classic smog results from large amounts of coal burning in an area and is caused by a mixture of smoke and sulfur dioxide. ... Smog is a problem in a number of cities and continues to harm human health.

Smog, community-wide polluted air. ... At least two distinct types of smog are recognized: sulfurous smog and photochemical smog. Sulfurous smog, which is also called “London smog,” results from a high concentration of sulfur oxides in the air and is caused by the use of sulfur-bearing fossil fuels, particularly coal.

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