pm2 5 anti virusface mouth mask for the elderly riverstar

Despriction:

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

Lead Time:

Quantity(Pieces) 1 - 50000 50000 - 100000 300000 - 350000 >500000
Est. Time(days) 1 2 7 Negotiable

2020__

Translate this page2020~E2020 30novelcoronavirusBye-bye blue More smog settling in-Translate this pageThe Ministry of Environmental Protection predicted that the dominant pollutant will be PM2.5particles 2.5 microns or less in diameter that pose hazards to human health. Schools are required to keep students indoors, and factories are required to limit or suspend output while the orange alert is

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Translate this pageTalk of The Town From sports celebrities to murderers South Africa's hero Oscar Pistorius was not the first sports star falling from grace for committing a murder.How to choose a right mask? - Translate this pageA 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.Life goes on under cloud of smog in Mexico City - China PlusBut the wildfires have undoubtedly made matters worse. They have sent the levels of PM2.5 soaring -- tiny particles produced by any fire that are the deadliest air pollutant. Authorities declared a pollution alert from Tuesday to Friday, after the micro-particle level hit 158 micrograms per cubic meter.

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