Add Yahoo as a preferred source to see more of our stories on Google. Mordkin says that with a good quality mask that has multiple layers (or when you’re double masking), filters aren’t entirely ...

We're all getting used to wearing face coverings while out and about, and you may have noticed that several masks have a small slot to place a filter for extra protection. Adding a filter in between ...

More than 20 states now require people to wear face coverings in public. As more states make wearing face coverings in public mandatory, many wonder if masks with filters are more effective. "Any ...