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Does a PM 2.5 filter help with coronavirus?

Cloth masks made of two layers of heavyweight cotton, especially those with a thicker and tighter weave, have been shown to be helpful in preventing the spread of respiratory droplets if worn correctly. Some masks have built-in pockets in which one may place a filter. Data on the use of additional filters is limited.

Answered by Dr. Molly Fleece, MD.

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