The air present inside the alveoli or the alveolar air usually has a higher amount of oxygen than carbon dioxide. The approximate composition of alveolar air under normal condition is 14% oxygen, 6% carbon dioxide, and 80% nitrogen.Click to see full answer. Consequently, why is the composition of inhaled air and alveolar air different?The composition of air in the atmosphere and in the alveoli differs. In addition, alveolar air contains a greater amount of carbon dioxide and less oxygen than atmospheric air. This is no surprise, as gas exchange removes oxygen from and adds carbon dioxide to alveolar air.Beside above, what is the alveolar air equation? The alveolar air equation is the method for calculating partial pressure of alveolar gas (PAO2). The equation is used in assessing if the lungs are properly transferring oxygen into the blood. Also, what is the composition of inspired air? The air that we inspire is a mixture of gases. The most important of these are nitrogen, oxygen, carbon dioxide and water vapour.What is alveolar ventilation?Alveolar ventilation is the exchange of gas between the alveoli and the external environment. Although alveolar ventilation is usually defined as the volume of fresh air entering the alveoli per minute, a similar volume of alveolar air leaving the body per minute is implicit in this definition.