CDC Recommends
Everyone can do their part to help us respond to this emerging public health threat by following CDC recommendations:

Wear a cloth face covering in public settings to avoid spreading COVID-19 to others in case you are infected but do not have symptoms.
The cloth face cover is meant to protect other people in case you are infected.
The cloth face coverings recommended are not surgical masks or N-95 respirators. Those are considered critical supplies that should be reserved for healthcare workers and other first responders, as recommended by CDC.
The cloth face covering is not a substitute for social distancing.
CDC continues to recommend that people try keep about 6 feet between themselves and others.

https://www.cdc.gov/coronavirus/2019-ncov/cases-updates/summary.html