What term refers to ambient air that is not enriched with supplemental oxygen?

• A. Room Air
• B. Nebulizer
• C. Sputum
• D. Post-tussive

Answer: (A)

Ambient air that isn’t enriched with supplemental oxygen is room air. In clinical practice, room air denotes breathing without added oxygen, reflecting the natural ambient oxygen content (about 21%). This term is used to distinguish baseline conditions from oxygen therapy, where the FiO2 is increased to support patients with hypoxemia. The other terms refer to a device that delivers medication as an aerosol (nebulizer), mucus coughed up from the lungs (sputum), and something occurring after a cough (post-tussive). Therefore, room air is the correct term.