If you have a Valve Mask, It’s Half Useles

If you have a Valve Mask, It’s Half Useles

In the age of COVID-19, we wear masks when out and about for two reasons:First, we hope they might protect us from other people, at least a little bit. (The science on this is not very convincing.) The second reason is more significant: they protect us from infecting others if it turns out we are infected and don’t know it.

Source: https://vitals.lifehacker.com/if-your-mask-has-a-valve-its-half-useless-1843182019

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