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. 2023 Apr 28;13:6950. doi: 10.1038/s41598-023-32180-9

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Workplace measurement: Results of (a) inspiratory CO₂ behind the mask (pCO₂in), (b) inspiratory and expiratory time (Ttot), (c) temperature behind the mask (Tmask), and (d) relative humidity behind the mask (RH) in 40 subjects wearing no mask (blue), surgical mask (yellow), community mask (green), and FFP2 (red).