Lea esta historia en español. DENVER — If you’re looking to upgrade your mask game but can’t afford higher-quality masks, you may want to go to your local public library later this week to pick some ...

With air pollution levels rising across cities, wearing a mask has become essential for protecting your lungs from harmful particles like PM2.5 and PM10. But simply wearing a mask isn’t enough ...

For the second day in a row, the eastern U.S. was enveloped in a hazy beige smog that blocked the skies and sun of early summer. Countless tiny particles from the raging Canadian wildfires—measuring 2 ...

SAN FRANCISCO -- Doctors say any mask is better than no mask, but cloth masks may not be getting the job done well enough against omicron. As cases surge, many are turning to N95 or KN95 masks to ...