Tech leaders often gather in boardrooms to make high‑stakes calls, but the air inside can sabotage decisions. A portable CO2 meter shows a closed meeting room can reach 2,143 ppm within an hour, a level that skews judgment. The writer carries the device everywhere to spot hidden fatigue.

Researchers at Lawrence Berkeley National Laboratory exposed that at 1,000 ppm, six of nine decision metrics dropped versus a 600‑ppm baseline, and at 2,500 ppm, seven metrics fell into a dysfunctional range. A parallel Harvard study linked rising CO2 to lower scores in strategy, planning, and high‑pressure analysis, the very skills a meeting demands.

Employees in cramped home offices face the same physics: stale air rises as the day progresses, creating mid‑afternoon fog. The writer’s own Halloween stunt—sealing a room in CO2—revealed that even brief exposure can sap focus, underscoring that teams spend critical thinking time in environments that degrade performance.

Fixing the problem is cheap: a CO2 monitor costs less than an hour of effort, and opening a window costs nothing. By measuring air quality like build pipelines or defect rates, executives can ensure that the room’s invisible variable no longer blunts decision quality during the second half of a meeting.