BBC4 年
Coronavirus: US 'wants 3M to end mask exports to Canada and Latin America'
A major US mask manufacturer, 3M, says the government has asked it to stop exporting US-made N95 respirator masks to Canada and Latin America. The request had "significant humanitarian ...
Rolling Stone14 天
These Face Masks Help Filter Out Smoke & Smog
The masks use three layers of filtration to filter out at least 95% of all non-oil-based airborne particles. These 3M face masks, meantime, are also NIOSH-approved and are used to help filter out ...