Centre for Environmental Policy, Imperial College London, London, UK.
Department of Engineering, University of Cambridge, Cambridge, UK.
Indoor Air. 2022 Oct;32(10):e13121. doi: 10.1111/ina.13121.
Experiments were conducted in an UK inter-city train carriage with the aim of evaluating the risk of infection to the SARS-CoV-2 virus via airborne transmission. The experiments included in-service CO measurements and the measurement of salt aerosol concentrations released within the carriage. Computational fluid dynamics simulations of the carriage airflow were also used to visualise the airflow patterns, and the efficacy of the HVAC filter material was tested in a laboratory. Assuming an infectious person is present, the risk of infection for a 1-h train journey was estimated to be 6 times lower than for a full day in a well-ventilated office, or 10-12 times lower than a full day in a poorly ventilated office. While the absolute risk for a typical journey is likely low, in the case where a particularly infectious individual is on-board, there is the potential for a number of secondary infections to occur during a 1-h journey. Every effort should therefore be made to minimize the risk of airborne infection within these carriages. Recommendations are also given for the use of CO sensors for the evaluation of the risk of airborne transmission on train carriages.
在英国城际列车车厢内进行了实验，旨在评估通过空气传播感染 SARS-CoV-2 病毒的风险。实验包括对车内 CO 的测量以及测量车厢内释放的盐气溶胶浓度。还使用计算流体动力学模拟对车厢内气流进行了可视化，同时在实验室中测试了 HVAC 过滤材料的效果。假设存在感染人员，那么在 1 小时的火车旅行中感染的风险比在通风良好的办公室中全天工作低 6 倍，比在通风不良的办公室中全天工作低 10-12 倍。虽然典型旅程的绝对风险可能较低，但在特别具有传染性的人在船上的情况下，在 1 小时的旅程中可能会发生一些继发感染。因此，应尽一切努力最大限度地降低这些车厢内空气传播感染的风险。还为 CO 传感器在评估火车车厢内空气传播风险方面的使用提出了建议。
