An article based on 100 Micron versus 5 micron 60 years ago has had fatal effects today.
20210522 WIRED article on Covid-19 and aerosols, WHO problem ODT.odt

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https://www.wired.com/story/the-teeny-tiny-scientific-screwup-that-helped-covid-kill/?utm_source=pocket-newtab-global-en-GB

The 60-Year-Old Scientific Screwup That Helped Covid Kill
All pandemic long, scientists brawled over how the virus spreads. Droplets! No, aerosols! At the heart of the fight was a teensy error with huge consequences.