What to know about N95 masks and respirators protecting against wildfire smoke, smog
Masks to protect against China's smog not always effective, tests show | CBC News
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Can you beat air pollution with masks
A female Chinese student wearing a face mask against air pollution cycles on the road in heavy smog in Tianjin, China, 19 October 2016. Beijing envi Stock Photo - Alamy
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Tourists wearing face masks against air pollution visit the Bund along the Huangpu River in heavy smog in Shanghai, China, 30 January 2018. Skywatch Stock Photo - Alamy
