CO2 exceeds 1000 ppm in closed rooms within one hour, cutting decision-making scores on six of nine LBNL metrics

The blog post documents Aranet4 readings climbing past 2000 ppm during standard meetings and links them to two chamber studies. Lawrence Berkeley National Laboratory exposed subjects to controlled CO2 levels while holding other variables constant. Performance on information usage, initiative, and strategic thinking declined measurably at concentrations routinely reached in occupied rooms. Harvard T.H. Chan School of Public Health longitudinal data on office workers showed parallel dose-response curves for cognitive domains tied to planning and crisis response.

Satish et al. 2012 in Environmental Health Perspectives quantified the effect sizes: seven of nine scales entered the dysfunctional range at 2500 ppm. Allen et al. 2016 replicated the pattern under real-building ventilation conditions rather than pure chambers. Both datasets indicate impairment begins below current ASHRAE 62.1 thresholds and compounds across multi-hour sessions typical of strategy or architecture reviews. Remote workers in sealed home offices experience identical partial-pressure increases.

Operationally this shifts the unit of analysis from individual performance to environmental control. Teams already instrument build pipelines and cycle times yet leave the partial pressure of the air they breathe unmonitored. Portable sensors costing under one engineer-hour allow direct measurement; simple dilution via door or window exchange restores baseline within minutes. Organizations that instrument meeting spaces and enforce 800 ppm caps can test whether mid-afternoon output variance narrows without changes to staffing or process.

Next steps require controlled A/B deployment across matched teams with pre-registered cognitive throughput metrics collected at 30-minute intervals.