Anyone read up on Covid and transmission/mitigation. knows that the SARS-Cov-2 virus likes to get airborne. 90%+ of transmission is airborne. This makes air quality important when it comes to protect people indoors.
https://www.scientificamerican.com/video/how-to-improve-indoor-air-quality/
British Medical Journal shares the professional opinion on not protecting children in schools etc, and their judgement on the British lack of protection is harsh. UK has a similar approach as Sweden on protection in schools etc.
Some people doesn’t believe in masks. Maybe because they don’t understand how they work. This article explains this pretty well.
https://www.wired.com/story/the-physics-of-the-n95-face-mask/