Demand for the masks to keep out PM2.5 has soared since 2012, with 2.53 billion of them sold last year. Photo: Reuters

Groups push for standards on PM2.5 anti-smog masks amid concern over fakes

Topic |   China pollution

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Demand for the masks to keep out PM2.5 has soared since 2012, with 2.53 billion of them sold last year. Photo: Reuters
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