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      Airborne bacterial species in indoor air and association with physical factors Translated title: Luftbårne bakterier i indekliamet og sammenhæng med fysiske forhold

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            The aim of this study is to obtain knowledge about which cultivable bacterial species are present in indoor air in homes, and whether the concentration and species composition of airborne bacteria is associated with different factors. Measurements have been performed for one whole year inside different rooms in 5 homes and once in 52 homes. Within homes, a room-to-room variation for concentrations of airborne bacteria was found, but an overlap in bacterial species was found across rooms. Eleven species were found very commonly and included: Acinetobacter lowffii, Bacillus megaterium, B. pumilus, Kocuria carniphila, K. palustris, K. rhizophila, Micrococcus flavus, M. luteus, Moraxella osloensis, and Paracoccus yeei. The concentrations of gram-negative bacteria in general and the species P. yeei were significantly associated with the season with highest concentrations in spring. The concentrations of P. yeei, K. rhizophila, and B. pumilus were associated positively with relative humidity, and concentrations of K. rhizophila were associated negatively with temperature and air change rate. Micrococcus flavus concentrations were associated negatively with air change rate. Overall, this study identified species which are commonly present in indoor air in homes, and that the concentrations of some species were associated with the factors: season, air change rate, and relative humidity.


            Author and article information

            UCL Open: Environment Preprint
            UCL Press
            30 January 2023
            [1 ] National Research Centre for the Working Environment, Lersø Parkallé 105, 2100 Copenhagen Ø, Denmark;
            [2 ] Division of Clinical Microbiology, Karolinska University Hospital, Stockholm, Sweden;
            Author notes

            This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY) 4.0 https://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited.

            : 30 January 2023
            Funded by: funder-id , Grundejernes Investeringsfund;

            The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
            Life sciences
            Bacillus megaterium,bacteria,exposure,home environment,indoor air,indoor humidity,MALDI-TOF MS,Paracoccus yeei,room-to-room variation,seasonality,Built environment,Health


            Date: 09 February 2023

            Handling Editor: Dr Yasemin D. Aktas

            Request revision. The Handling Editor requested revisions; the article has been returned to the authors to make this revision.

            2023-02-09 12:32 UTC

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