1.   As the stale air travels slowly through the flues, so carbon dioxide flows out and oxygen flows in.

2.   He lurched forward and groped his way up the staircase, gasping and retching in the stale air.

3.   The office, which displayed portraits of both the last president and the new one, was filled with stale air.

4.   The room was full of stale air and tobacco smoke.

5.   Walking clears the mind and removes stale air from the lungs.

6.   A layer of smoke hung low in the stale air.

7.   Lips compressed into a thin line of tension, she strode along the corridor and into her office, wrinkling her nose at the musty smell of stale air.

8.   Along with their tobacco, the teens inhale the stale air of the abandoned building.

9.   As an electric fan stirred the stale air, Kassindja, wearing a long, cream-colored caftan, instructed one of his wives to train it on him.

10.   Behind a chain link fence, ventilation fans wheeze amid piles of waste rock as they pump stale air up from the mines far below.