When I told you this test is very simple, I meant it. All you have to do is hold your mask to the light if you’re curious to see how protected you are when you wear it, writes The Washington Post. Or, you can even use your phone’s flashlight or indoor lights to test its efficacy.
According to Gregory Poland, MD, director of the Mayo Clinic’s Vaccine Research Group, you know a mask is effective when you can’t see through it when you hold it to the light. If you’re able to see through your mask, then you shouldn’t wear it, explained Poland.
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