Article on effectiveness of wearing face masks..they are ..

[dezii]

While not 100% effective, they definitely help in preventing the spread of the virus...better we wear them then not..
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"“Face masks could help to reduce transmission in the community particularly if used in public transport and crowded areas,” says Ben Cowling, head of epidemiology and biostatistics at the University of Hong Kong.

He and his colleagues recently published a study looking at the effectiveness of face masks to prevent the spread of the virus from infected people. "
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"Provided enough people wear masks when venturing out in public, it could have a dramatic impact on how quickly the coronavirus starts to spread again, particularly if combined with other measures such as social distancing and handwashing.

One unpublished study by scientists at Arizona State University found that if 80% of people wore only moderately effective masks, it could reduce the number of deaths in New York by 17-45% over a two month period. Even wearing masks that were just 20% effective could cut mortality by 24-65% in Washington and 2-9% in New York, if enough people wore them."
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www.bbc.com/future/article/20200504-coronavirus-what-is-the-best-kind-of-face-mask