What happens to a mask when it becomes moist?

When a mask becomes moist, it becomes ineffective. This is because moisture can compromise the mask's ability to filter out pathogens and particulates effectively. Masks are designed to work best when they are dry, as moisture can create a pathway for droplets to bypass the filtration system. Additionally, wet masks can provide a more favorable environment for the growth of bacteria and other microorganisms, which can pose further risks to both the wearer and those around them.

While wearing a mask that has become wet may seem harmless at first, its primary function, which is to protect against airborne contaminants, is significantly diminished. Therefore, it's crucial to replace a moist mask promptly to ensure proper protection and hygiene.