What are the Best and Worst Masks for Preventing COVID-19 Spread?

Face masks are required in several states and jurisdictions, and the “no mask no service” is strictly enforced by many establishments. When I am out and about, I also see a wide variety of masks being used, and always wondered which ones really work and which ones don’t. What I really wanted to know was which mask is the worse type and which ones are are best for preventing the spread of COVID-19.

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