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  The Indoor Chemical Human Emissions and Reactivity (ICHEAR) project: Overview of experimental methodology and preliminary results

Beko, G., Wargocki, P., Wang, N., Li, M., Weschler, C. J., Morrison, G., et al. (2020). The Indoor Chemical Human Emissions and Reactivity (ICHEAR) project: Overview of experimental methodology and preliminary results. Indoor air: international journal of indoor air quality and climate. doi:10.1111/ina.12687.

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 Creators:
Beko, Gabriel1, Author
Wargocki, Pawel1, Author
Wang, Nijing2, Author              
Li, Mengze2, Author              
Weschler, Charles J.1, Author
Morrison, Glenn1, Author
Langer, Sarka1, Author
Ernle, Lisa1, Author
Licina, Dusan1, Author
Yang, Shen1, Author
Zannoni, Nora2, Author              
Williams, Jonathan2, Author              
Affiliations:
1external, ou_persistent22              
2Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              

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 Abstract: With the gradual reduction of emissions from building products, emissions from human occupants become more dominant indoors. The impact of human emissions on indoor air quality is inadequately understood. The aim of the Indoor Chemical Human Emissions and Reactivity (ICHEAR) project was to examine the impact on indoor air chemistry of whole-body, exhaled, and dermally emitted human bioeffluents under different conditions comprising human factors (t-shirts/shorts vs long-sleeve shirts/pants; age: teenagers, young adults, and seniors) and a variety of environmental factors (moderate vs high air temperature; low vs high relative humidity; presence vs absence of ozone). A series of human subject experiments were performed in a well-controlled stainless steel climate chamber. State-of-the-art measurement technologies were used to quantify the volatile organic compounds emitted by humans and their total OH reactivity; ammonia, nanoparticle, fluorescent biological aerosol particle (FBAP), and microbial emissions; and skin surface chemistry. This paper presents the design of the project, its methodologies, and preliminary results, comparing identical measurements performed with five groups, each composed of 4 volunteers (2 males and 2 females). The volunteers wore identical laundered new clothes and were asked to use the same set of fragrance-free personal care products. They occupied the ozone-free (<2 ppb) chamber for 3 hours (morning) and then left for a 10-min lunch break. Ozone (target concentration in occupied chamber ~ 35 ppb) was introduced 10 minutes after the volunteers returned to the chamber, and the measurements continued for another 2.5 hours. Under a given ozone condition, relatively small differences were observed in the steady-state concentrations of geranyl acetone, 6MHO, and 4OPA between the five groups. Larger variability was observed for acetone and isoprene. The absence or presence of ozone significantly influenced the steady-state concentrations of acetone, geranyl acetone, 6MHO, and 4OPA. Results of replicate experiments demonstrate the robustness of the experiments. Higher repeatability was achieved for dermally emitted compounds and their reaction products than for constituents of exhaled breath.

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 Dates: 2020
 Publication Status: Published online
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 Rev. Type: -
 Identifiers: ISI: 000538290300001
DOI: 10.1111/ina.12687
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Title: Indoor air : international journal of indoor air quality and climate
Source Genre: Journal
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Publ. Info: Oxford : Wiley-Blackwell
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: ISSN: 1600-0668
CoNE: https://pure.mpg.de/cone/journals/resource/1600-0668