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Inquiry Pm2.5 Anti Virusface Mouth Mask For The Elderly In Benin

How to choose a right mask? 防霾口罩您戴正确了吗?-千龙网· …

A level-A mask is for heavy pollution use when the PM2.5 concentration is above 500 microgram per cubic meter. A level-D mask is prepared for medium and low air pollution. Following the instruction and trying it on to check whether a mask perfectly fits on your face is the third step.

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