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  Total OH Reactivity of Emissions from Humans: In Situ Measurement and Budget Analysis

Wang, N., Zannoni, N., Ernle, L., Bekö, G., Wargocki, P., Li, M., et al. (2021). Total OH Reactivity of Emissions from Humans: In Situ Measurement and Budget Analysis. Environmental Science & Technology, 55(1), 149-159. doi:10.1021/acs.est.0c04206.

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 Creators:
Wang, Nijing1, Author              
Zannoni, Nora1, Author              
Ernle, Lisa1, Author              
Bekö, Gabriel, Author
Wargocki, Pawel, Author
Li, Mengze1, Author              
Weschler, Charles J., Author
Williams, Jonathan1, Author              
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              

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 Abstract: Humans are a potent, mobile source of various volatile organic compounds (VOCs) in indoor environments. Such direct anthropogenic emissions are gaining importance, as those from furnishings and building materials have become better regulated and energy efficient homes may reduce ventilation. While previous studies have characterized human emissions in indoor environments, the question remains whether VOCs remain unidentified by current measuring techniques. In this study conducted in a climate chamber occupied by four people, the total OH reactivity of air was quantified, together with multiple VOCs measured by proton transfer reaction time-of-flight mass spectrometry (PTR-ToF-MS) and fast gas chromatography–mass spectrometry (fast-GC–MS). Whole-body, breath, and dermal emissions were assessed. The comparison of directly measured OH reactivity and that of the summed reactivity of individually measured species revealed no significant shortfall. Ozone exposure (37 ppb) was found to have little influence on breath OH reactivity but enhanced dermal OH reactivity significantly. Without ozone, the whole-body OH reactivity was dominated by breath emissions, mostly isoprene (76%). With ozone present, OH reactivity nearly doubled, with the increase being mainly caused by dermal emissions of mostly carbonyl compounds (57%). No significant difference in total OH reactivity was observed for different age groups (teenagers/young adults/seniors) without ozone. With ozone present, the total OH reactivity decreased slightly with increasing age.

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Language(s): eng - English
 Dates: 2020-12-092021
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1021/acs.est.0c04206
 Degree: -

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Title: Environmental Science & Technology
  Abbreviation : Environ. Sci. Technol.
Source Genre: Journal
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Publ. Info: Easton, PA : American Chemical Society
Pages: - Volume / Issue: 55 (1) Sequence Number: - Start / End Page: 149 - 159 Identifier: ISSN: 0013-936X
CoNE: https://pure.mpg.de/cone/journals/resource/954921342157