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. 2025 May 15;7:1564864. doi: 10.3389/ftox.2025.1564864

TABLE 3.

Respiratory tract properties utilized in MPPD modeling.

Respiratory tract properties Input values
Oral/URT Volume (mL) 50
Functional Residual Capacity (mL) 3,000
Oral Humidity (%) 80
Lung Humidity (%) 99.9
Oral Interface Temperature (˚C) 20
Lung Temperature (˚C) 37

URT, upper respiratory tract.