Folks have been screaming for this since the pandemic started. The CDC is now making recommendations for better ventilation in buildings. They want you to aim for five air changes an hour, through MERV-13 filters. You can read all the recs here, but the air changes (which means swapping all the air in the building out) are a big deal and will make a huge difference in keeping people safe from airborne illnesses.
This isn’t a law or a new regulation yet or anything, as far as I can tell. It’s just, y’know. Highly recommended. Strongly suggested. That kind of thing.
Notes & Thoughts 