The masks that are necessary to stop viruses are extreme. They only use them in special labs. There is a ISO standard that was known far before 2019. And still some people that work with them think that they are unnecessary.

Probably because our healthy immune system can handle them. Our airways have an immune system on their own, with special cells that capture viruses. This protection of this system is reduced when wearing a mask that restricts airflow.

The only problem are people with a weak airway immune system and those could be given such special masks. Problem solved.

Against SARS-Cov2 there were no masks necessary. The sun breaks it down quickly. It was very weak and can be treated very well with Ivermectin and HCQ links But because Bill Gates needed an emergency use for the clotshots, the corrupt agencies stepped in to block these medicine. Literally murdering people.