Office CO₂ & Ventilation Dashboard

The default band is below ~1000 ppm for good indoor air (outdoor ≈420 ppm; >1400 ppm impairs concentration). 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.

Aim to keep occupied spaces below about 1000 ppm; outdoor air is ~420 ppm, so the rise above that is essentially 'rebreathed' air. Studies link CO₂ above roughly 1000–1400 ppm to measurable drops in concentration and decision-making, and the same under-ventilation raises airborne-infection risk because exhaled aerosols accumulate alongside the CO₂. It's a proxy, not a toxin at these levels — the CO₂ itself isn't harmful until much higher, but it reliably signals that fresh-air supply is inadequate for the number of people present. Boost ventilation when the peak climbs.

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.