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Cloth masks are not very effective, study reveals

Scientists have warned that cloth masks worn by people with a hope to reduce their exposure to air pollution are not as effective as they think and are giving the users a false sense of security.Cloth masks are not very effective, study reveals
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Garima Chaulagain
Published at : August 31, 2016
Updated at : August 31, 2016 09:40
Kathmandu


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