Haze Day N95, KN95 or surgical mask: which works for haze?
Well-fitted N95, KN95 or FFP2 respirators filter fine particles; ordinary surgical masks do not seal to the face and are not effective against PM2.5. Fit matters as much as the rating.
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Getting a good fit
Cover nose and chin, press the nose strip, and check for gaps at the edges. Facial hair and loose straps reduce protection. Masks are not recommended for very young children.
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Sources
- NEA 1-hour PM2.5 readings (Singapore) — National Environment Agency (NEA), Singapore · official site · API / docs