The thermosphere is the fourth layer of the earth's atmosphere and is located above the mesosphere. The air is thin in the thermosphere. The earth's thermosphere also includes the region of the atmosphere, called the ionosphere. The ionosphere is the region of the atmosphere that is filled with charged particles such as $O _{2}^{+}$, $O ^{+}, NO ^{+} .$The high temperature in the thermosphere can cause molecules to ionize.
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 -