N95 masks are the US standard for respirator masks.
Like KN95 respirators, N95 respirator masks are designed to capture 95% of tiny particles (0.3 micron particles, to be exact).
The advantage of N95 respirator masks is that they have slightly stricter requirements from US NIOSH Certification for pressure drop while inhaling and exhaling. That means they are required to be slightly more breathable than KN95 masks.
Surgical N95 respirators are both approved by NIOSH as N95 respirators and cleared by the FDA as surgical masks as they
are also designed and tested for fluid resistance. These products are frequently referred to as medical respirators, healthcare
respirators, or surgical N95s.