In the N95 mask, what does the "N" denote?

The "N" in the N95 mask designation indicates that the mask is "not resistant to oil." This classification is part of a broader rating system developed by the National Institute for Occupational Safety and Health (NIOSH) to specify the filtration capabilities and resistance to various types of aerosols.

The "95" in N95 signifies that the mask is designed to filter out at least 95% of non-oil-based airborne particles, which is a crucial factor in its effectiveness for respiratory protection. Masks like the N95 are widely used in healthcare settings to protect wearers from respiratory pathogens, dust, and other particulates. Understanding the meaning of the "N" is essential, as it guides users on the appropriate contexts for wearing the mask, especially regarding oil-based substances, which require a mask with different specifications, such as a "R" or "P" designation for oil resistance.