Are cloth masks effective for Covid? Surgical masks vs. KN95 explained
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No good choices: A mask may block out some pollution but have other ill health effects
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New Design Helps N95 Mask Wearers Breathe Easier | Scientific American
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![Type IIR Surgical Face Mask x 50 [UK Made] – Medisave UK](http://www.medisave.co.uk/cdn/shop/products/img_5484_1.jpg?v=1679930236 "Type IIR Surgical Face Mask x 50 [UK Made] – Medisave UK")
Type IIR Surgical Face Mask x 50 [UK Made] – Medisave UK
Covid: How effective are face masks at stopping the spread of the virus? | The Independent
