Human Responses in Public Health Emergencies for Infectious Disease Control: An Overview of Controlled Topologies for Biomedical Applications

Table 2

Penetrability according to particle size [54].

Particle size	Penetration degree in the human respiratory system
>11 m	Passage into nostrils and upper respiratory tract
7–11 m	Passage into the nasal cavity
4.7–7 m	Passage into larynx
3.3–4.7 m	Passage into trachea-bronchial area
2.1–3.3 m	Secondary bronchial area passage
1.1–2.1 m	Terminal bronchial area passage
0.65–1.1 m	Bronchioles penetrability
0.43–0.65 m	Alveolar penetrability