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Evolution of respiratory droplet Sauter Mean diameter (SMD), known as D32, over ten cough cycles. Linear fit: with mask (a = −0.725, b ≈ 56.14) and without mask (a = −0.215, b ≈ 73.27). The environmental conditions are zero wind speed, ambient temperature 20 °C, pressure 1 atm, and relative humidity 50%. The mouth temperature is 34 °C and the temperature of the face skin is 32 °C.
