Indoor TVOC Air Quality Dashboard

The default band is below ~500 µg/m³ TVOC for good comfort (guidance varies; <300 is often cited as the comfort target). 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.

TVOC (total volatile organic compounds) is the combined reading of many airborne organics — from paints, adhesives, new furnishings, cleaning agents, air fresheners, cooking and printers. Low-cost sensors estimate the total but can't identify individual compounds and respond differently to each, so treat TVOC as a relative trend indicator rather than a precise toxicology figure. The useful patterns: a high baseline after renovation that should decay with ventilation over days/weeks; sharp spikes during cleaning or printing; and any unexplained sustained rise signalling a new source. Respond with ventilation and source control (low-VOC products, letting new items off-gas before installation), and use the dashboard to confirm levels are actually falling.

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.