白宫网站12月8日刊发了题为《洁净的室内空气惠及每一个人》的说明，提到“通过改善室内通风和空气过滤，Covid室内传播可以减少 80%”（原文：For over two years, our experience with the COVID-19 has emphasized the importance of clean indoor air as a vital tool for response and recovery — transmission can be reduced by 80% with improved indoor ventilation and air filtration）的说法。

https://s.weibo.com/weibo?q=%E6%B4%81%E5%87%80%E7%9A%84%E5%AE%A4%E5%86%85%E7%A9%BA%E6%B0%94%E6%83%A0%E5%8F%8A%E6%AF%8F%E4%B8%80%E4%B8%AA%E4%BA%BA