What is the chemical makeup of air and how does it affect the environment?

Air is primarily composed of nitrogen (about 78) and oxygen (about 21), with small amounts of other gases like carbon dioxide and argon. These gases play a crucial role in the environment by regulating temperature, supporting life through respiration, and influencing weather patterns. However, human activities, such as burning fossil fuels, release pollutants into the air, leading to air pollution and negative impacts on the environment, including climate change and health problems.