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N95, medical or cloth face masks: Which is best against the Omicron COVID-19 variant? Canada's latest guidance explained - The Globe and Mail
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What is the best mask for COVID-19? A mechanical engineer explains the science after 2 years of testing masks in his lab
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Is your N95-style mask failing you? Lab tests show some falling way short of filtration standards | CBC News
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Is your N95-style mask failing you? Lab tests show some falling way short of filtration standards | CBC News
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