What is in fresh air?

Fresh air primarily consists of nitrogen (about 78%) and oxygen (about 21%), with trace amounts of other gases such as argon, carbon dioxide, and water vapor. It may also contain small quantities of pollutants, dust, pollen, and other particulates, depending on the environment. The balance of these components is crucial for supporting life, particularly for respiration in humans and animals. Fresh air is often associated with clean, unpolluted environments, contributing to overall health and well-being.