How can you know if your mask is working and if the air you're breathing is safe?

The Dose - Podcast tekijän mukaan CBC - Torstaisin

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With the COVID-19 variants spreading in Canada, infectious disease specialist Dr. Lynora Saxinger joins Dr. Brian Goldman to break down the newest science around masks, with tips on which ones you should be wearing, how to fit them, and how to tell if your mask is working.