As the peak of the fifth COVID-19 wave approaches, we've been navigating this pandemic for two years. Experts now confirm SARS-CoV-2 spreads primarily through aerosols—fine airborne particles. A key challenge: about half of infected individuals are asymptomatic, unknowingly spreading the virus and heightening transmission risks.
To curb contaminations, health guidelines emphasize ventilating enclosed spaces with crowds, effectively limiting viral spread. Supporting this, a study published December 22 in Physics of Fluids by researchers at IBM Research Europe modeled droplet patterns from passengers in a ventilated train car, mimicking TGV airflow—air blown in from above and extracted below. They assessed contamination risks by seat position.
Key findings: For an uninfected passenger, the aisle seat poses the highest risk, as droplets from the middle seat flow directly toward you. Conversely, if you're infected and seated by the aisle, you pose the lowest risk to others—your droplets head straight to the ventilation system. The safest overall choice? The window seat, where droplets are efficiently expelled upward.
