What is a mask valve, and why are cities banning them?

In California’s Bay Area, there’s a new stipulation: You can wear any style of mask you want, so long as it doesn’t have a valve in it. What? Why? Because a mask with a valve may protect you from some pathogens in the air, but it doesn’t protect the people around you from your own breath. proudly sells masks that do not have valves. 

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