A closed meeting room can hit 2,000 ppm CO2 within an hour.

Lawrence Berkeley National Laboratory found decision-making performance dropped on 6 of 9 measures at 1,000 ppm, and turned “dysfunctional” past 2,500, compared with clean air.

The write-up argues teams blame fatigue for a problem a CO2 monitor and an open window would fix.

Sources: Hacker News