I came across this set of excellent infovideos about how to make indoor spaces safer.
I thought the v short one about ventilation and carbon dioxide monitoring could be useful for business (cafe, restaurant, shop, office) owners https://www.youtube.com/watch?v=vLsR4e8gLEY, although this lovely weather will mean that windows and doors are open by default, hopefully.
This is really useful. Of course ancestors knew the importance of good ventilation to prevent airborne infection. Hence the high ceilings in public buildings, schools, churches etc. In private houses, a high ceiling was a status symbol. Modern architecture has lost this in many cases, in a drive to cut heating costs. Some new buildings (and a certain double decker bus) don't have any opening windows at all.
Let them wear wool, I say! 60 years ago I went to school in the winter with a full set of wooly underwear, which caused ridicule when the elastic wore and the pants drooped below the leg of my shorts!
Thanks for sharing this Julia, its a really useful reminder that we're a long way from being out of the woods yet!