Which mask should I be wearing right now? – SFGate

Wearing a mask every time you leave your home to prevent the spread of COVID-19 has become routine for most of us. But as wildfires rage across Northern California, it’s easy to wonder if that cloth mask you normally reach for is the best kind to wear right now.The problem with cloth masks, according to UCSF professor of medicine John Balmes, is that they’re variable. Some masks are homemade, some only have two layers of fabric as opposed to the three layers recommended by the CDC and these clot…

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