What is Air?

Explore the composition, importance, and facts about air. Learn about the impact of air pollution through case studies and statistics.

Introduction to Air

Air is the invisible mixture of gases that surrounds us and is essential for sustaining life on Earth. It is made up of nitrogen, oxygen, carbon dioxide, and other trace gases. In this article, we will explore the composition of air, its importance, and some interesting facts about it.

Composition of Air

Air is primarily composed of nitrogen (78%) and oxygen (21%). The remaining 1% consists of carbon dioxide, argon, and other gases. This composition is crucial for the survival of plants, animals, and humans, as oxygen is needed for respiration and carbon dioxide is essential for photosynthesis.

Importance of Air

Air plays a vital role in regulating the Earth’s atmosphere, weather patterns, and climate. It also helps in the dispersal of seeds, pollen, and other reproductive materials for plants. Moreover, air is essential for the transportation of sound waves, enabling us to hear and communicate with each other.

Interesting Facts about Air

  • Air has weight and exerts pressure on objects.
  • Air expands when heated and contracts when cooled.
  • Air pollution is a major concern, with pollutants such as smog, particulate matter, and greenhouse gases affecting air quality.

Case Studies

In highly polluted cities like Delhi, India, air quality levels often reach hazardous levels, leading to health complications for residents. Efforts to reduce air pollution through regulations and cleaner technologies have been implemented to improve air quality.


According to the World Health Organization, around 91% of the world’s population lives in places where air quality exceeds the recommended limits. Poor air quality is responsible for millions of premature deaths each year due to respiratory diseases and other health issues.

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