Ambient air refers to atmospheric air in its natural state. Ambient air typically consists of 78% nitrogen and 21% oxygen. The remaining 1% is a combination of carbon, helium, methane, argon, and hydrogen. The closer the air is to sea level, the higher the percentage of oxygen. Responds to various inquiries about the interpretation of the definition of “ambient” air as it pertains to situations involving leased land under the PSD regulations. Ambient air is primarily composed of 78% nitrogen and 21% oxygen. It’s considered natural and uncontaminated, meaning it’s not significantly affected by industrial emissions, vehicle exhaust, or other pollutants. Ambient (outdoor) air pollution in both cities and rural areas was estimated to cause 4.2 million premature deaths worldwide per year in 2019; this mortality is due to exposure to fine particulate matter, which causes cardiovascular and respiratory disease, and cancers. Ambient air contains approximately 21% oxygen, 78% nitrogen, with minute amounts of carbon dioxide and other gases. Supplemental oxygen therapy replaces the inert gas (e.g., nitrogen) with oxygen. The quality of your air indoors can be a great source of health and comfort. Let us clean your ductwork to help your indoor air quality become healthy for your family. Ambient air is basically the natural state of air in the outdoor environment, and is what humans and animals breathe. Plants and other organisms need it for survival, too. Ambient air refers to the natural state of atmospheric air, free from air-borne pollutants. Its composition typically consists of 78% nitrogen and 21% oxygen, with the remaining 1% made up of carbon, helium, methane, argon, and hydrogen. The objective of ambient air sampling is determining the quality of ambient air as it relates to the presence and concentration of substances regarded as pollutants. Ambient air is a complex mixture of gases, particles, and biological matter. Its composition varies based on location, time of day, weather patterns, and human activities.