grey color anti pollution mask |
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| navigate by keyword : 2019 air allergy asia asian background black caucasian city corona coronavirus covid danger dangerous disease down environment epidemic face female filter flu gas health human ill infection infectious influenza isolated lock man mask medical mouth n95 ncov outbreak person pm25 pollution prevention protect protection protective safety sick smog smoke street toxic unhealthy urban vector virus wearing white woman wuhan |
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| A half-face dust mask is generally worn to protect the wearer from small particulate matter |
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