International Research Journal of Public and Environmental Health

Original Research Article

Microbiological contamination of the air at two high-traffic-volume roundabouts in Cotonou, Benin

Lucrèce Marie Karine Codjo-Seignon*1, Emmanuel Ghislain Sopoh1, Cyriaque Degbey1,2, Raoul Zinhota2 and Martin Pépin Aina3

1Regional Institute of Public Health, University of Abomey-Calavi, Benin.
2University Hospital Hygiene Clinic of National University Hospital Center Hubert Koutoukou Maga in Cotonou, Benin.
3Water Science and Technology Laboratory of the National Water Institute, University of Abomey-Calavi, Benin.

*Corresponding Author Email: karineseignon(at)

Lucrèce Marie Karine Codjo-Seignon

Emmanuel Ghislain Sopoh

Cyriaque Degbey

Raoul Zinhota

Martin Pépin Aina

Article Number: irjpeh.21.012  |   Pages: 87-97  |   Vol. 8 (2), March 2021   |   DOI:

 Received: December 4, 2020  Accepted: January 28, 2021  Published: February 10, 2021


Little has been documented about microbiological air pollution in Africa though it is vital to understanding our environment and the related health risks. This study has assessed the bacterial and fungal contamination of the air at two high-traffic-volume roundabouts in Cotonou as well as to assess the intensity of exposure at these two locations. Air samples were taken at the Akpakpa PK3 roundabout (roundabout A) and the Vèdokô Cica-Toyota roundabout (roundabout B) using a microbial air sampler (BAOSHISHAN FKC-1) and then grown on different media to identify fungi, staphylococci, enterococci, streptococci and enterobacteria. Staining and microbiological tests (Gram stain, catalase test, oxidase test and deoxyribonuclease test) helped identify the microbes. The intensity of exposure was estimated based on the volume of air aspirated and the duration of exposure. The air samples from the two roundabouts contained a similar number of fungi (approximately 400 CFU (colony-forming units)/m3). There were, however, differences in their contents (Syncephalastrum sp. in the samples from the roundabout A; Rhizopus sp. and Chrysonilia sp. in the samples from the roundabout B; and Fusarium sp., Aspergillus niger, Aspergillus flavus, Cladosporium sp. and Penicillium sp. in the samples from both roundabouts B). There were twice as many Gram-positive bacteria (Staphylococcus aureus, Staphylococcus sp., Bacillus sp., Lactobacillus sp. and Micrococcus sp.) in the roundabout A samples (163 CFU/m3) than in the roundabouts B samples (76 CFU/m3). This study shows the presence of pathogenic bacteria and fungi in the ambient air at the two roundabouts, thus constituting a potential health risk.


Pollution, traffic volume, microorganism, outdoor air, environment, Health risk.

How to Cite this Article

Codjo-Seignon LMK, Sopoh EG, Degbey C, Zinhota R, Aina MP (2021). Microbiological contamination of the air at two high-traffic-volume roundabouts in Cotonou, Benin. Int. Res. J. Pub. Environ. Health 8(2):87-97.

Author(s) retain the copyright of this article. Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License.

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