In vivo measurements of inhalability of ultralarge aerosol particles in calm air by humans

Yu Tung Dai, Yow Jer Juang, Yi ying Wu, Patrick N. Breysse, Der Jen Hsu

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


This work measured the nasal inhalability of ten human subjects in different inspiratory flow rates under calm air condition and compared the results with the manikin studies in the literature. The results obtained indicate significant inhalability differences exist when human subjects breathe at rest versus moderate exercise. The difference however is within 10% of uncertainty limit and is not practically important in designing air sampler. The cutoff size for nasal inhalation was found to be approximately 135 μ m, particles larger than this size will not be the concern for human health. The comparison of the in vivo and manikin measurements suggests the natural convective air current, resulting from the human body heat, might interact with the settling of airborne particles in calm air and cause a slightly higher inhalability for particles smaller than 50 μ m. This study concludes that the revision of the current ACGIH IPM is recommended and the human inhalability under typical windspeeds at workplaces should be taken into account.

Original languageEnglish (US)
Pages (from-to)967-973
Number of pages7
JournalJournal of Aerosol Science
Issue number8
StatePublished - Aug 2006


  • Calm air
  • Human subject
  • Inhalability
  • Ultralarge aerosol particles

ASJC Scopus subject areas

  • Environmental Engineering
  • Pollution
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes
  • Atmospheric Science


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