She estimates that these types of masks will provide 70% to 79% of filtration of particles. Masks with four or more layers could provide 80% to 90% filtration. This means that single-layer masks ...

It’s tempting to compartmentalize the fires tearing through Southern California as some kind of environmental freak accident. The reality is more sobering. “It’s important to point the ...

It filters 95% of particulate matter, just like the N95 mask, says Dr. Nina Shapiro, a pediatric ear, nose and throat specialist at Westside Head and Neck in California. KN95 masks are the Chinese ...

“You want a good seal so that all of the air that’s breathed in is pulled in through the mask body. That’s where all the filtration of particles and microbial contaminants occurs.” ...

The OxiClear N99 Face Mask is a reusable, high-filtration mask equipped with 20 activated carbon filters to protect against dust, allergens, and pollution. It can filter PM2.5 particles ...