N95 masks, also called N95 respirators, are personal protective equipment (PPE) that filter airborne particles such as ...

Here is an example of health care professionals in Oakland California, undergoing fit testing for N95 respiratory masks. A person sprays in a substance to determine if the person can smell or taste it ...

More-infectious variants of the coronavirus and new federal requirements have people rethinking the quality of their face masks to prevent the spread of Covid-19 until more people can be vaccinated.