Fresh air is a term used to describe the air that is found OUTDOORS, away from pollutants and other contaminants. OZONE, which is composed of three oxygen atoms, is a naturally occurring gas in the Earth's atmosphere that helps protect us from the sun's ultraviolet radiation. OUTDOORS and OUTSIDE are terms used to refer to the environment OUTSIDE of buildings or other enclosed spaces. All of these terms are related to fresh air, which is the air found in natural outdoor environments.