Air filters, also reducing transmission in indoor settings. Additionally, air quality monitors to identify where air quality improvements are needed:
https://twitter.com/MeGupsta/s...
空气过滤器，也减少了室内环境中的传播。此外，空气质量监测器可确定需要改善空气质量的地方：
https://twitter.com/MeGupsta/s...