This chapter outline and lecture notes from the "Outdoor Emergency Care: A Patroller’s Guide to Medical Care" textbook focus on respiratory emergencies encountered in outdoor settings. It begins by reviewing the anatomy and physiology of breathing, including respiratory rates for different age groups and the mechanics of ventilation. The material then describes various common respiratory emergencies, such as asthma, COPD, hyperventilation syndrome, pulmonary embolism, and pneumothorax, outlining their signs, symptoms, and common causes. Furthermore, it details the assessment of patients experiencing breathing difficulties, emphasizing vital signs, physical examination, and recognizing signs of acute distress. Finally, the chapter covers the initial management of respiratory emergencies, including airway management, positioning, oxygen administration, and assisting with inhaler use, illustrated with a case study and skill activities for lung auscultation and inhaler assistance.