1. 

   ahimsa Senior Member (Voting Rights)

   Messages:

   2,692

   Location:

   Oregon, USA

   [Moderators - if there's a better thread for this please move. Thanks!]
   Schools cut covid-19 sick days by 20 per cent using HEPA air filters
   
   https://www.newscientist.com/articl...k-days-by-20-per-cent-using-hepa-air-filters/
   
   (paywall, but first few sentences are visible)
   

    

   ahimsa, Oct 21, 2023

   #1

   EzzieD, Wits_End, Hutan and 7 others like this.
2. 

   Sean Moderator Staff Member

   Messages:

   7,490

   Location:

   Australia

   Can't access the full article, but I hope they used a dummy filter arm as well. That would provide a clear answer either way.

    

   Sean, Oct 22, 2023

   #2

   alktipping, NelliePledge, shak8 and 2 others like this.

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