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

To test the masks, the breath of patients with asthma or COPD were monitored for nitrite, a biomarker for inflammation in both conditions. The results showed that the masks accurately detected the ...

While traditional cloth masks or disposable cotton face masks offer basic protection ... This article explores critical scenarios requiring respiratory safety and how the M Pro redefines ...

over a 14-day period. The researchers reported that 163 participants of 2,371 assigned to wear face masks versus 239 of 2,276 of non-wearers self-reported respiratory symptoms. The researchers ...