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dc.contributor.authorAganovic, Amar
dc.contributor.authorBi, Yang
dc.contributor.authorCao, Guangyu
dc.contributor.authorDrangsholt, Finn
dc.contributor.authorKurnitski, Jarek
dc.contributor.authorWargocki, Pawel
dc.date.accessioned2021-12-16T12:48:59Z
dc.date.available2021-12-16T12:48:59Z
dc.date.issued2021-08-23
dc.description.abstractA novel modified version of the Wells-Riley model was used to estimate the impact of relative humidity (RH) on the removal of respiratory droplets containing the SARS-CoV-2 virus by deposition through gravitational settling and its inactivation by biological decay; the effect of RH on susceptibility to SARS-CoV-2 was not considered. These effects were compared with the removal achieved by increased ventilation rate with outdoor air. Modeling was performed assuming that the infected person talked continuously for 60 and 120 min. The results of modeling showed that the relative impact of RH on the infection risk depended on the ventilation rate and the size range of virus-laden droplets. A ventilation rate of 0.5 ACH, the change of RH between 20% and 53% was predicted to have a small effect on the infection risk, while at a ventilation rate of 6 ACH this change had nearly no effect. On the contrary, increasing the ventilation rate from 0.5 ACH to 6 ACH was predicted to decrease the infection risk by half which is remarkably larger effect compared with that predicted for RH. It is thus concluded that increasing the ventilation rate is more beneficial for reducing the airborne levels of SARS-CoV-2 than changing indoor RH. Practical implications: The present results show that humidification to moderate levels of 40%–60% RH should not be expected to provide a significant reduction in infection risk caused by SARS-CoV-2, hence installing and running humidifiers may not be an efficient solution to reduce the risk of COVID-19 disease in indoor spaces. The results do however confirm that ventilation has a key role in controlling SARS-CoV-2 virus concentration in the air providing considerably higher benefits. The modified model developed in the present work can be used by public health experts, engineers, and epidemiologists when selecting different measures to reduce the infection risk from SARS-CoV-2 indoors allowing informed decisions concerning indoor environmental control.en_US
dc.identifier.citationAganovic, Bi Y, Cao, Drangsholt, Kurnitski, Wargocki. Estimating the impact of indoor relative humidity on SARS-CoV-2 airborne transmission risk using a new modification of the Wells-Riley model. Building and Environment. 2021;205:1-14en_US
dc.identifier.cristinIDFRIDAID 1933583
dc.identifier.doi10.1016/j.buildenv.2021.108278
dc.identifier.issn0360-1323
dc.identifier.issn1873-684X
dc.identifier.urihttps://hdl.handle.net/10037/23419
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalBuilding and Environment
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2021 The Author(s)en_US
dc.subjectVDP::Technology: 500::Building technology: 530en_US
dc.subjectVDP::Teknologi: 500::Bygningsfag: 530en_US
dc.titleEstimating the impact of indoor relative humidity on SARS-CoV-2 airborne transmission risk using a new modification of the Wells-Riley modelen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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