Source avec lien : Building and Environment, 223. 10.1016/j.buildenv.2022.109392
Les événements de rassemblement de masse ont été fermés dans le monde entier en 2020 afin de minimiser la propagation du virus SRAS-CoV-2. Les recherches émergentes sur la transmission du SRAS-CoV-2 ont souligné l’importance d’une ventilation suffisante. Cet article présente les résultats d’une étude de surveillance de la qualité de l’air intérieur (QAI) sur 82 événements dans sept auditoriums ventilés mécaniquement pour soutenir le programme de recherche sur les événements du gouvernement britannique.
Abstract Mass-gathering events were closed around the world in 2020 to minimise the spread of the SARS-CoV-2 virus. Emerging research on the transmission of SARS-CoV-2 emphasised the importance of sufficient ventilation. This paper presents the results of an indoor air quality (IAQ) monitoring study over 82 events in seven mechanically ventilated auditoria to support the UK government Events Research Programme. Indoor carbon dioxide concentration was measured at high resolution before, during, and after occupancy to allow for assessment of the ventilation systems. Generally, good indoor air quality was measured in all auditoria, with average IAQ found to be excellent or very good for 70% of spaces. In some auditoria, spatial variation in IAQ was identified, indicating poor mixing of the air. In addition, surface and air samples were taken and analysed for the presence of bacteria by culture and SARS-CoV-2 using RT-qPCR in one venue. SARS-CoV-2 RNA was detected on a small number of surfaces at very low copy numbers, which are unlikely to pose an infection risk. Under the ventilation strategies and occupancy levels investigated, it is likely that most theatres pose a low risk of long-range transmission of COVID-19.