Question:

Photochemical smog always contains

Updated On: Jul 28, 2022

$O_3$
$CO$
$CH_4$
$PO_4$

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The Correct Option is A

Solution and Explanation

Photochemical smog is grey or yellow brown opaque smog having oxidising environment with little smoke. Photochemical smog contains secondary pollutants or photochemical oxidants. It was first reported over Los Angeles in $1940s$. Photochemical smog is formed at high temperature over cities and towns due to still air, emission of nitrogen oxides and carbohydrates from automobile exhausts and solar energy. Nitrogen dioxides splits into nitric oxide and nascent oxygen. Nascent oxygen combines with molecular oxygen to form ozone. Ozone reacts with carbohydrates to form aldehydes and ketones. Nitrogen oxides, oxygen and ketones combine to form peroxy-acyl-nitrates $(PAN)$. In areas with intense solar radiations, photoelectrical smog forms brown air.

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Concepts Used:

Atmospheric Pollution

The pollution that directly harms living organisms is the atmospheric pollution, air is more essential than food when it comes to the survival of life on earth. Atmospheric pollution is, consequently, a major concern for life on the planet. The most common type of air pollution that affects much of the world is Smog (smoke + fog).
Pollution is the outcome of undesired changes in the environment with harmful effects on plants, animals, and humans. The element that causes pollution is commonly known as pollutants.
Pollutants may be solids, liquids, or gases that are present in large quantities in nature and produced due to human activities or natural circumstances.
For instance, materials such as dichlorodiphenyltrichloroethane (DDT), heavy metals, chemicals, plastic materials, nuclear waste, etc., once disclosed to the environment it is difficult to remove.

Causes of Atmospheric Pollution:

There is a number of factors that contribute to the pollution of the environment. Some of the major causes of atmospheric pollution are given below -

Industrial waste
Usage of pesticides
Deforestation
Combustion of fuels
Nuclear Explosions
Use of Toxic Solvents