https://blogs.cdc.gov/niosh-science-blog/2023/02/03/diy-filtration/ i don't think i'd heard about this cdc study on diy air filtration until now (it only came out in february of this year so it's pretty recent) but hot damn, the best case scenario (better filters + universal masking) showed a 94% reduction in relative exposure.
it's a good piece, very readable, and mentions a lot of other useful things, but 94%
blogs.cdc.govThe Effectiveness of DIY Air Filtration Units | Blogs | CDCCDC - Blogs - NIOSH Science Blog – The Effectiveness of DIY Air Filtration Units -
the cdc publishing something real hits different when you're a covid realist tbh
it's like the "even fox news said x" of pandemics
@chrisisgr8 That's with masks, though. Without masks it's 78%. Masks alone are 75%. As expected, the combined effect is the product of the effects, i.e., 100%-(22%×25%)≈94%.