Japan knew it was airborne and changed policies early. “in rooms with dry, stale air—people coughing, sneezing, & even talking & singing, emit tiny particles that defy gravity—able to hang in air for many hours or even DAYS, and travel length of a room.” https://www.cbsnews.com/news/coronavirus-japan-has-long-accepted-covids-airborne-spread-and-scientists-say-ventilation-is-key/

2) The key defense against aerosols, Tsubokura said, is diluting the amount of virus in the air by opening windows and doors and ensuring HVAC systems circulate fresh air.

3) “In open-plan offices, he said partitions must be high enough to prevent direct contact with large droplets, but low enough to avoid creating a cloud of virus-heavy air (55 inches, or head height.) Small desk fans, he said, can also help diffuse airborne viral density. “

4) To researchers in Japan, the (WHO) admission of airborne aerosols felt anti-climactic.

Densely populated Japan has operated for months on the assumption that tiny, "aerosolized" particles in crowded settings are turbo-charging the spread of the new coronavirus.

5) But Japan's infamously congested trains, he argues, probably aren't as as risky as his model suggests. "It is very crowded, and the air is bad," Kurokabe said. "But nobody is speaking, and everyone is wearing a mask. The risk is not that high."

6) “Even riding on a crowded subway train — if windows are kept open, as they are in Japan these days — "is much safer than a pub, restaurant or gym," said Waseda University's Tanabe.

7) Masking noses and mouths is all the more important, he said, because his research shows men touch their faces up to 40 times an hour. (He said women, more likely to wear makeup, are less face-touchy.)

8) Good time to revisit this Japanese aerosol simulation of microdroplets hanging in the air and moving through a room with just one cough. https://twitter.com/drericding/status/1280708110127181824?s=21 https://twitter.com/DrEricDing/status/1280708110127181824