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Conference Paper

CO2 emission rates from humans when sleeping and awake. Impact of environmental factors and age

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Williams,  Jonathan
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Citation

Wargocki, P., Sakamoto, M., Fan, X., Kuga, K., Ito, K., Williams, J., et al. (2022). CO2 emission rates from humans when sleeping and awake. Impact of environmental factors and age. In Proceedings of Indoor Air 2022: 17th International Conference of the International Society of Indoor Air Quality & Climate - University of Eastern Finland, Kuopio, Finland.


Cite as: https://hdl.handle.net/21.11116/0000-000D-414A-7
Abstract
We summarize our three recent studies that determined CO2 emission rates from humans using the mass-balance model and the measured steady-state CO2 concentration. One study determined CO2 emission rates from sleeping adults; they were on average 11 L/h/person, 30-45% than for awake people at a light activity. They were relatively stable and similar to the published work and estimations using models. Two studies determined CO2 emission rates from the sedentary awake people at a light activity; they were on average 12.9-17.8 L/h/person. They were not significantly different between teenagers, young adults, and the elderly, nor when ozone and relative humidity increased. Reduced ventilation and increased CO2 significantly reduced CO2 emission rates; the changes in respiration could be the plausible reason. CO2 emission rates increased at thermal sensation departing from neutrality; increased metabolic activity could be the plausible reason. The emission rates were different from published results and estimations using models.