• Oxygen is supplied in hospitals for patients with respiratory conditions such as asthma and COVID-19.

• Used in ventilators, anesthesia machines, and hyperbaric oxygen therapy (HBOT) for wound healing.

• Low concentrations of CO₂ are used to test respiratory responses in pulmonary function studies.

• A mix of helium and oxygen (Heliox) is used for patients with airway obstruction, asthma, or COPD, reducing airway resistance and improving breathing.

• Nitrous Oxide, known also as Laughing Gas, is used in hospitals for surgical anesthesia, providing pain relief and unconsciousness when combined with oxygen.

• Carbon Dioxide is used in laparoscopy, endoscopy, and cryotherapy for minimally invasive surgical procedures.