https://www.reuters.com/article/us-health-coronavirus-japan-supercompute/japan-supercomputer-suggests-changes-to-travel-work-amid-airborne-virus-threat-idUSKBN2490PE

Supercomputer-driven models simulated in Japan suggested that operating commuter trains with windows open and limiting the number of passengers may help reduce the risk of coronavirus infections, as scientists warn of airborne spread of the virus.