this post was submitted on 12 Mar 2025
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[โ€“] amino@lemmy.blahaj.zone 3 points 1 day ago* (last edited 1 day ago) (1 children)

I think the glasses fogging up has been somewhat debunked. you can have a mask pass a fit test and still fog up your glasses because you're still exhaling moist/hot air through your mask even when it fits properly.

also the N95 equivalent would be FFP2

[โ€“] philpo@feddit.org 3 points 1 day ago

Nope,it hasn't. If your glasses are fogging up in sync with your respiration rate or within a very short timeframe your mask is not sealing. Period. The only difference is when you have either have a valve mask, work with a face shield or similar things or in confined spaces - it's basically impossible to fog up your glasses with a correctly positioned mask as the filter medium does work as a diffuser. If your mask does fog up suddenly despite a confirmed fit it usually is a warning sign for a breakdown of the filter medium.

(And believe me, we tried really hard - as part of a customer contract we tested all major mask manufacturers available in the EU, with a sample size in the 4 digit range, including UV fluid and thermal imaging tests)

I am fully aware that the equivalent of N95 is often seen as comparable to FFP2, but this is not actually quite correct. The FFP2 has a slightly worse filtration rate and a slightly higher resistance both for inspiration and expiration. Anyway, I intentionally wrote FFP3 as this is the recommended FFP class for Measles while within the NIOSH legislation only a N95 is recommended.