Fiber filters (like masks and HEPAs) actually get BETTER at capturing particles over time. As more particles get stuck, it makes it even harder for other particles to get through.
It’s worth noting, however, that while masks get better at capturing particles as they are used, they may get harder to breathe through. Masks clogged with particles have a higher air resistance, which will affect the breathability.
Read more: How long to masks like N95 and N99 masks last?
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