What is the definition of ambient air?

Ambient air refers to the air surrounding us in our immediate environment. This encompasses the breathable atmosphere that is present in our surroundings and can include a variety of gases, including oxygen, nitrogen, and trace amounts of other substances. It is critical for life as it provides oxygen for respiration and plays a role in various environmental processes.

While the average composition of a planet's air describes the general make-up of the atmosphere on a larger scale, it doesn't specifically capture the essence of ambient air as it relates to our immediate environment. The idea of an air mass at room temperature might suggest certain conditions of the air, but it doesn’t encompass the broader definition of ambient air, which isn't limited by temperature. Air devoid of pollutants would imply a specific quality of air rather than its definition, as ambient air can contain pollutants depending on the area and conditions. Thus, the most fitting definition is that ambient air is simply "the air around us."