An average adult inhales and exhales about eight liters of air per minute and 11,520 liters of air per day, writes focus.it.
The inhaled air consists of about 20% oxygen, while the exhaust air contains only 15%, so we inhale 2,304 liters of oxygen and release 1,728 liters back into the environment.
The difference is that we consume with each breath during the day, carried by the lungs to the cells of the body, which in turn give carbon dioxide in the blood about 576 liters (slightly more than 0.5 m3) of oxygen per day.
Of course, these "accurate" figures, which were useful for the calculations, are actually approximate, as the actual amount of oxygen consumed varies according to body size, activity involved, and various pathologies.