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in hopes of fighting the highly transmissible omicron variant, the biden administration is giving out higher quality masks for free. 400 million n95 masks will be released from the national strategic stockpile next week. >> university of massachusetts biology professor aaron brummage joins us now. great to see you, professor. so i have a couple of examples right here, this n95 mask. this is the one with ear straps. how long can i wear one of these before having to use a new one? >> yeah, in a non-medical environment, you can easily wear them for a week. sometimes even two weeks. the key is if they get wet, you really want to replace them, and if they get dirty, you want to replace them, and if you start feeling resistance when you're breathing through them, you want to replace them, but if you look

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