03/06/2021
Single use masks (normally one layer, very thin) are typically only effective at capturing larger dust particles, but can do so fairly well.
Surgical mask standards have higher requirements for capturing virus-sized (0.1 micron) particles, however they vary by region.
Pollution masks (respirators) typically capture >95% of virus-sized particles.
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Mask standards can be confusing! This simple guide covers what the ratings mean in (mostly) plain English and how they vary by country.