Impact of natural ventilation on exposure to SARS-CoV 2 in indoor/semi-indoor terraces using CO2 concentrations as a proxy

From microscopic droplets to macroscopic crowds: Crossing the scales in models of short-range respiratory disease transmission, with application to COVID-19

“…These concentration maps give insight into the transmission risks in binary interactions, highlighting the paramount effect of the respiratory activity, owing to the much larger volume of respiratory droplets expelled while talking, as compared to mouth-breathing; the effect of (even very modest) winds or ambient air flows is also apparent. The impact of air flows had been reported previously in case studies of specific (mostly indoor) settings [32,49,51,[70][71][72]; its generality is underscored here. Our study further shows how the walking velocity of pedestrians also contributes to decreasing the risks, through the same mechanism.…”

Identification of source location in a single-sided building with natural ventilation: Case of interunit pollutant dispersion

“…A three-storey building model with a single-sided opening was built. In this study, carbon dioxide ( ) is used as tracer gas to simulate the viruses which is generally effective for inter-unit dispersion of small bioaerosols (order of or lower) [ [47] , [48] , [49] , [50] ]. Based on CFD simulations, the characteristics of airflow and concentration fields in and around the building are investigated.…”

A novel CO2-based demand-controlled ventilation strategy to limit the spread of COVID-19 in the indoor environment

“…Zivelonghi et al [ 32 ] developed a natural ventilation strategy to mitigate aerosol infection risk in school buildings based on CO 2 monitoring. Rivas et al [ 33 ] studied the natural ventilation impact on exposure to SARS-CoV-2 in terraces using the indoor CO 2 concentration as the proxy for risk assessment. In Ref.…”