Tsed: The following information are my personal Opinions. 1. For allergy season for dust and pollen 2. To hide Fake smiles 3. To hide your face for any reason 4. To annoy others Masks, especially N95/KN95 masks can help stop 95% of the pollutants in the air coming in from outside. Others masks could decrease some pollutants. The air, especially closed space air, just as water could be a place to live for many microbes.

They are billions of trillions of lives. Sometimes it might be a good idea to clean the air or wash it because we and everyone before us use the same air. The air inside closed spaces could house microbes and jump to the unsuspecting guest to the environment. More research should be done on different closed space air samples to see if they house harmful substances including viruses.