MN is a 20-year-old male who was transported to the ED by EMS because of an episode of sudden shortness of breath experienced at his place of employment. Physical assessment reveals a muscular young adult male in moderate respiratory distress. There is no evidence of trauma. Respiratory rate 32, temperature 98.7o F, SpO2 (on room air) 91%. His recent history is that he had a sudden onset of shortness of breath immediately after lifting several heavy boxes at work.
Which of the following would be the most appropriate location for the small volume nebulizer in this patient?