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Number of droplets (> 5 µm) and particles including aerosols (> 0.5 µm). Number of droplets (> 5 µm) and particles including aerosols (> 0.5 µm) in room air under three different oxygen delivery modalities (5 L/min of nasal cannula, 30 L/min of HFNC, or 60 L/min of HFNC) and three breathing patterns (rest breathing, speaking, and coughing), with or without surgical masks, is shown. HFNC high-flow nasal cannula. *p < 0.05, ratio paired t test
