Related Clues:

• The 'pneumo' in pneumonia
• See 116-Across
• Chest organ
• It's breath-taking
• Space station supply
• It's breathtaking
• See 52-Down
• What 'pneumo-' means
• Kind of mask
• Something in the air
• Of sound mind
• Oxygen processor
• O
• Place for a breath of fresh air?
• Air bag?