Infection Control · single question
A surgical N95 mask provides what level of filtration protection?
Show answer and explanation
Correct answer: A. 95% particle filtration
- A. Correct. An N95 respirator filters at least 95% of airborne particles (0.3 microns or larger) when properly fitted. The 'N' means Not resistant to oil; '95' means ≥95% filtration efficiency. Required for protection against airborne pathogens like TB and for aerosol-generating dental procedures.
- B. Incorrect. 85% filtration corresponds to an N85 mask designation.
- C. Incorrect. 99.97% filtration is the standard for HEPA filters (used in air purifiers) — not N95 masks.
- D. Incorrect. 65% filtration is below the standard for N95 masks.
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