New York — Last Friday, the US Centers for Disease Control and Prevention (CDC) officially recommended widespread use of face masks to help slow the spread of Covid-19.

These aren’t the medical-grade N95 facial respirator masks — which continue to be in short supply and should be reserved solely for healthcare professionals on the front-lines of the pandemic battle — or the allergen-, pollutant-, and germ-filtering masks from Airnium ($69 to $99) that Gwyneth Paltrow wore on Instagram...

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