The World, and Everything in it: People across the US have relied on KN95 face masks for protection. But the majority imported from China have failed safety standards.

Around two-thirds of imported respirator masks from China failed to meet safety standards, according to a report from a nonprofit that the safety and quality of healthcare equipment.
Researchers tested nearly 200 KN95 style respirators and found they filtered out fewer than 95% of particles, the minimum requirement for US safety certification.
Sub-par respirators can offer better protection than nothing at all, but they could leave healthcare workers vulnerable to infection while working with coronavirus patients, experts say.

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So you think those masks are saving you Maskateers well think again

The World, and Everything in it