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Is one-way masking effective?

With the mask requirement for major public transportation no longer in effect, some might be wondering - Will I still be protected if I wear a mask?
Published: Apr. 25, 2022 at 10:01 AM PDT
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PORTLAND Ore. (KPTV) - With the mask requirement for major public transportation no longer in effect, some might be wondering - Will I still be protected if I’m the only one wearing a mask?