Office CO2 Buildup & Cognitive Performance (2D)

A closed office is a well-mixed box: every occupant exhales CO₂ at a near-constant rate while the HVAC system trades stale air for outdoor air at a rate that depends on ventilation design and occupancy. This simulator solves that mass balance live — set how many people are in the room, how much fresh air arrives per person, how large the room is, and how hard people are working, and watch the CO₂ concentration climb toward its steady state on a top-down floor plan, a rolling concentration graph, and a live cognitive-performance curve built from the concentration bands reported in published indoor-air-quality research.