He then uses a condensation particle counter—a device that measures ... (For comparison, he found that a surgical mask alone had between about 50 and 75 percent filtration efficiency, depending ...

The surgical masks included some with EN 14683 certification ... aerosol particles in the collecting tube counted by a particle counter. The average filtration efficacy was lowest for the cloth ...

Other stores are keeping their stock of free N95s behind the counter, so you may need to ask a sales associate for help. Some of the 400 million N95 masks from the Strategic National Stockpile are ...

The first thing you see are the masks — the N-95s, the surgical masks ... (their personal information being shared online) by counter-protesters. “To us, the optics are communicating that ...

The results are relevant for many groups including policy makers investigating how to counter aerosol generation ... it is helpful to know that N95 and surgical masks are most effective, but ...

The French government has now mandated that citizens wear single-use surgical FFP1 masks, more protective ... would be focused squarely on ways to counter the spread of variants on the continent.

Administrators counter that doctors and nurses ... he was told by his boss he had been reinstated and could wear a surgical mask around the hospital and an N95 for procedures.

Wearing a face mask is a vital measure to prevent the spread of COVID-19, even if you are fully vaccinated. While surgical and cloth masks offer some protection, N95s and KN95s masks, called ...