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CDC: Double masking can block more than 90% of infectious particles If air is coming out the sides of your mask, particles are probably spreading. So the CDC’s endorsement of double masking aims to prevent that leakage. By: McKenna King and last updated 2021-02-11 17:49:35-05 TAMPA, Fla. — As the transmission of the COVID-19 virus reaches new records, you’re likely seeing more and more people heading out with two masks on. So the big question is, are these people paranoid, or are they proactive? New research from the CDC shows it’s likely the latter. “...