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Abstract
Background. Aircraft cabins are special environments. Passengers sit in close proximity in a space with low pressure that they cannot leave. The cabin is ventilated with a mixture of outside and recirculated air. The volume of outside air impacts the carbon footprint of flying. Higher recirculation air rates could be considered to save energy and divert less kerosene from producing thrust. Objectives. To investigate whether higher recirculation air rates in aircraft cabins negatively affect passengers' health and well-being and if occupancy plays a role in this. Methods. In a 2 (occupancy: full and half-occupied) X 4 (ventilation regime) factorial design with stratified randomization, participants were exposed in an aircraft segment in a low-pressure tube during a four-hour simulated flight. Ventilation regimes consisted of increasing proportions of recirculated air up to a maximum CO2 concentration of 4200 ppm. Participants rated comfort, health symptoms, and sleepiness multiple times. Heart rate (variability), as stress marker, was measured continuously. Results. 559 persons representative of flight passengers regarding age (M=42.7, SD=15.9) and sex (283 men) participated. ANCOVA results showed hardly any effect of both factors on self-reported health symptoms, strong main effects of occupancy on comfort measures, and interaction effects for sleepiness and physiological stress parameters: Participants in the half-occupied cabin hardly reacted to increased recirculation air rates and show overall more favorable responses. Participants in the fully occupied cabin reported higher sleepiness and had stress reactions when the recirculation air rate was high. Discussion. This large-scale RCT shows the importance of occupancy, a previously neglected factor in indoor air research. The proximity of other people seems to increase stress and exacerbate reactions to air quality. Further studies on causal pathways are needed to determine if recirculation air rates can be increased to reduce the carbon footprint of flying without detrimental effects on passengers.
| Dokumententyp: | Zeitschriftenartikel |
|---|---|
| EU Funded Grant Agreement Number: | 820872 |
| EU-Projekte: | Horizon 2020 > Sonstige > Joint Technology Initiative > Joint Technology Initiative - Clean Sky 2 |
| Publikationsform: | Publisher's Version |
| Keywords: | cabin air quality, proxemics, comfort, sleepiness, health symptoms, heart rate variability |
| Fakultät: | Medizin > Institut und Poliklinik für Arbeits-, Sozial- und Umweltmedizin |
| Themengebiete: | 600 Technik, Medizin, angewandte Wissenschaften > 600 Technik
600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit |
| URN: | urn:nbn:de:bvb:19-epub-93980-6 |
| ISSN: | 0013-9351 |
| Bemerkung: | Clean Sky 2 Joint Undertaking, European Union (EU), Horizon 2020 |
| Sprache: | Englisch |
| Dokumenten ID: | 93980 |
| Datum der Veröffentlichung auf Open Access LMU: | 23. Dez. 2022, 14:32 |
| Letzte Änderungen: | 24. Apr. 2024, 09:05 |
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