A client with chronic obstructive pulmonary disease (COPD) is experiencing worsening dyspnea and low oxygen levels. The vital signs are assessed as a temperature of 99.6°F (37.5°C), heart rate 98 beats/minute, respirations 28 breaths/minute, blood pressure 140/82 mm Hg, and an oxygen saturation 88% on room air. Which action should the nurse implement?