breathingair
breathingair is a term that generally refers to the air that is safe and suitable for human respiration. This typically implies air that is free from harmful contaminants, pollutants, or excessively low oxygen levels. The composition of normal atmospheric air is approximately 78% nitrogen, 21% oxygen, 0.9% argon, and trace amounts of other gases including carbon dioxide.
In specialized contexts, "breathing air" can refer to air supplied from a source other than the ambient
The quality of breathing air is critical for health and safety. Inadequate breathing air can lead to