Five years after Donald Trump declared a national COVID emergency, here's what the research says about face masks.

But the Food and Drug Administration has also approved some KN95 and FFP2 masks made in China and Europe that offer comparable protection. Disposable surgical masks are also made of non-woven fabric.

Has your COVID-era mask been a constant companion or is it collecting dust? Americans’ relationship with masking has been fraught (and politicized) since the beginning of the pandemic, a time when ...