Classroom CO₂ Monitoring Dashboard

The default band is below ~1000 ppm (many education guidelines flag 1000–1500 ppm as the action range). Treat it as a sensible starting point — your own specification, regulator, equipment manual or product datasheet sets the authoritative limits, and you can read your true band straight off the worst case those documents allow. Edit the readings against whatever band applies to you.

Because classrooms are densely occupied and often poorly ventilated, and CO₂ is a cheap, real-time gauge of how much fresh air the room is actually getting per person. High levels correlate with reduced concentration and learning performance and with higher spread of airborne respiratory infections — both major concerns in schools. Many education authorities now distribute CO₂ monitors and set action thresholds (commonly around 1000–1500 ppm) prompting staff to ventilate. The monitor makes an invisible problem visible and actionable, and logging the per-lesson peak documents which rooms need ventilation upgrades.

Match the interval to the consequence and the rate of change: where an excursion spoils product or risks safety, log continuously (or as often as you can sample); where it is merely informative, daily or per-shift spot checks suffice. The in-range % and excursion count only mean something if your sampling is regular — sparse, irregular readings hide the excursions between them.

Yes — every reading is stored in this browser's localStorage on your device and nothing is uploaded to any server, which also makes the dashboard usable on sites with strict data policies. For shared, audit-grade records across a team or for regulatory retention, export the values into your own system.