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Huge numbers of people are wearing face masks – in Japan and South Korea there have been reports of stores selling out. But experts are divided on how effective they are

Masks may not be great against viruses or pollution, according to experts.
 Masks may not be great against viruses or pollution, according to experts. Photograph: d3sign/Getty Images
As the death toll from coronavirus steadily rises, east Asian countries such as Taiwan have stepped up production of surgical face masks to meet demand. In the Chinese city of Wuhan, at the centre of the outbreak, it is mandatory to wear one in public places, and there have been reports of stores in Japan and South Korea selling out.
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