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Can masks really filter the particulate matter as small as

While discussing today about the faq entry on PM 10 versus PM 2.5 which I posted yesterday, my friend Klaus challenged on the usefulness of protection masks. He was actually wondering if the modern masks can nowadays really filter efficiently all the small harmful PM 2.5 particulate matter? Actually, this is a very good question!

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Face masks could raise pollution risks

People can get a false sense of security from flimsy gauze, and linger too long outdoors in toxic air, argue Wei Huang and Lidia Morawska. PM 2.5 is associated with more than 4 million deaths

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