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Table 6 Penetration of 10 μm (d a ) through respiratory tract regions relative to particles entering the respiratory tract

From: Thoracic and respirable particle definitions for human health risk assessment

V daily(%-tile) Normal   Gradual  
  Augmenter a Mouth-breather a Augmenter a Oral only a
  P(ET) avg P(TB) avg P(ET) avg P(TB) avg P(ET) avg P(TB) avg P(ET) avg P(TB) avg
Male         
5% 0.05b 0.03 0.21 0.10 0.11 0.05 0.43 0.21
50% 0.04 0.02 0.19 0.08 0.11 0.04 0.36 0.15
95% 0.03 0.01 0.19 0.06 0.10 0.03 0.32 0.12
Female         
5% 0.06 0.03 0.15 0.07 0.06 0.03 0.41 0.20
50% 0.04 0.02 0.15 0.06 0.07 0.02 0.35 0.14
95% 0.03 0.01 0.16 0.05 0.07 0.02 0.31 0.11
Child-B c         
5% 0.05 0.02 0.16 0.08 0.16 0.08 0.38 0.18
50% 0.03 0.01 0.15 0.06 0.14 0.06 0.31 0.13
95% 0.02 0.01 0.14 0.04 0.13 0.04 0.27 0.09
Child-A d         
5% 0.10 0.05 0.21 0.10 0.21 0.10 0.38 0.18
50% 0.07 0.04 0.19 0.09 0.18 0.07 0.31 0.13
95% 0.05 0.02 0.17 0.05 0.16 0.05 0.27 0.09
  1. P(ET), extrathoracic penetration for 10 μm particles; P(TB), tracheobronchial penetration for 10 μm particles; aData are daily averages, all activity levels weighted by daily ventilation; bFraction penetration; cScaling factor in Equations 2 and 3 equal to 1.26; dScaling factor in Equations 2 and 3 equal to 1.0.