When do we have to wear a mask outside? The C.D.C. says less often, and here’s how and why.

By BY THE NEW YORK TIMES from Health Coronavirus (2019-nCoV), Masks, Content Type: Service, Coronavirus Risks and Safety Concerns, interna...

By BY THE NEW YORK TIMES from Health
Coronavirus (2019-nCoV), Masks, Content Type: Service, Coronavirus Risks and Safety Concerns, internal-essential