Ok, I didn't read the article yet, but I have been trying to read as much as I can about airborne transmission and the use of ventilation for prevention.

I finally had the piano tuner here (yay!) and he was in my piano room for a little over an hour. He wore a mask and we also wore masks the whole time he was here, even though we weren't in the piano room. After he left, I opened two cross windows and put fans up to pull air in one window and push it out the other. We kept our masks on during that and for about an hour afterwards. Check back in two weeks... :P

Separate from that, I note that my office window (on campus) doesn't open, and I not to spend much time there even when we are back to teaching on campus (if we ever actually get to that point...)

I know the idea of adding HEPA air filter machines to classrooms is being tossed around.

Also, it seems that it is easy to pull older information off the web and run with that. In this quickly evolving pandemic, that can be a dangerous choice for policy-makers...