Know what is in your indoor air — and what to do about it.
Envora One tracks CO₂, PM2.5, VOCs, humidity, CO, light, sound and more in one calibrated monitor. £249. No home subscription.
11 channels. Factory calibrated. Full data access. No home subscription.
- No home subscription
- Factory calibrated
- Signed calibration certificate
- API · MQTT · Home Assistant
- Local-only mode available
- 30-day returns
- 2-year warranty
Buy Envora One
A single device for the room you spend the most time in. £249, one-time, no subscription.
Get a Fleet quote
Schools, landlords, workplaces — multi-device dashboards, audit, SSO and reports.
Find the right setup
Two questions about your space and we'll route you to the right starting point.
A serious air monitor, not just a coloured light.
Envora is the calibrated indoor air monitor for people who need the numbers, not just a coloured light. Here is what sets it apart.
More than a coloured light
Eleven sensor channels with raw values, history, and a single fused IAQ score. Read the curve, not just the colour.
No subscription for home users
Live readings, alerts, dashboards, history and integrations included for the life of the device — free for personal households.
Built for data ownership
Full API, MQTT broker, CSV export and local-only mode. Your readings stay yours. Envora sells hardware, not your data.
Homes, schools, landlords, workplaces
One device that earns its place in a bedroom, a classroom, a rental, a clinic or a podcast booth — same dashboard everywhere.
API, MQTT, Home Assistant
First-class integrations from day one. Subscribe over MQTT, query the REST API, or drop straight into Home Assistant.
Factory calibrated, certified
Every Envora One is bench-calibrated against reference instruments and ships with a signed calibration certificate per serial.
"Envora sells hardware. Your readings are the point of the product, not the business model."
As trusted by teams at
One device. Every environment.
From a nursery to a trading floor, Envora One sits where work and life happen — and tells you what the air is doing.
Home
Kitchens, bedrooms, nurseries, basements. Envora shows you what you breathe — and tells you how to fix it, usually for free.
ExploreOffice & Co-work
CO₂ is the single strongest environmental lever on office productivity — and the cheapest to fix. Envora gives facilities teams and founders the number to argue with.
ExploreCO₂ and indoor air quality monitoring for schools
Classroom CO₂ and indoor air quality evidence for better ventilation decisions, measurable cognitive lift, and the data trail governors and parents want.
ExploreEvery channel you need. One device.
One body replaces a shelf of point instruments — NDIR, electrochemical, laser scattering and Bosch BME690 — all factory-calibrated before it leaves our bench.
On a shelf. On a desk. In a studio.
Built to sit unobtrusively in a kitchen, a nursery, a recording booth or a boardroom. Anodised aluminium upper, recycled-polycarbonate base, and a diffused halo that stays out of the way until you need it.
- USB-C powered · 200–500 mA typical draw
- 92 × 92 × 36 mm · 180 g · Graphite or Mist
- Whisper-quiet · fan only during PM sampling
- Factory-calibrated · certificate in the box
A family of quiet instruments.
One platform. Two devices. More on the way. Each one purpose-built, calibrated at our bench, and routed through the same dashboard, MQTT topic and API.
Eleven channels. One IAQ score.
A complete indoor-air monitor. Particles, gases, humidity, CO₂, CO, light and sound — fused into a single drift-compensated reading, calibrated at our bench.
- 11 channels
- WiFi · USB-C
- Factory-calibrated
- 2-year warranty
Real-time radon. Becquerels on the wall.
A continuous radon monitor — not a 90-day cassette. Watch levels move past the WHO and UKHSA thresholds before they build, room by room.
- 0–2,000 Bq/m³
- WiFi · USB-C
- Same dashboard
- Bedroom-safe
Buy it once. Free for homes.
One hardware price — £249 Envora One, £229 Envora Radon — and the home features stay free for personal household use. Organisations pay Envora Fleet per managed device — Starter from £3/device/mo, Team £5/device/mo, Estate £7/device/mo, Enterprise custom.
What Envora helps you catch.
The invisible risks that shape how you sleep, think and feel at home. Envora puts a name, a number and a plan against each one.
Mould & damp risk
Mould does not appear from nowhere. It is the visible end of months of sustained humidity your house has been trying to tell you about.
Read the guideLong-term toxic gas exposure
A CO alarm chirps at 35 ppm. Your nervous system reacts at 1. Envora watches the band that does not set anything off — but accumulates anyway.
Read the guideCooking pollution
Frying on a gas hob can push PM2.5 past a London roadside reading in six minutes. Most domestic extractors were never designed for it.
Read the guideSleep & bedroom air
The most important seven hours of your day happen in the room you measure the least. CO₂ triples overnight; humidity plummets; light and sound shape every sleep cycle.
Read the guideAllergies & dust sensitivity
Dust mites, pollen, pet dander and chemical irritants all have fingerprints. Envora reads them so you can manage the triggers, not just the symptoms.
Read the guideOutdoor air events
Wildfire smoke, urban traffic peaks, garden bonfires. The wrong ventilation strategy turns a bad outdoor hour into a bad indoor week.
Read the guideIndoor air is 2–5× more polluted than outdoor air.
We spend 90% of our lives indoors. What you can't see is measurably shaping how you sleep, how you focus, and how you feel a decade from now.
We could feel our daughter's nursery was off. Envora showed us 1,200 ppm CO₂ at 3 AM. A trickle vent later — 650 every morning. Sleep has never been better.
Learn the air you breathe.
Radon is a 90-day average problem — until you see the curve
A cassette gives you a number for a form. A continuous monitor gives you a curve to act on. The difference is which hours of the day you were exposed.
The hotel-room reset is missing one step
Ten minutes of focused ventilation between guests resets VOCs and humidity. Almost no hotel does it — and the reviews show it.
Treadmill-room CO₂ — the gym signal nobody measures
Cardio rooms generate respiratory CO₂ at three times the rate of a meeting room. The ventilation design rarely accounts for it.
Wednesday, 3 PM. The meeting-room peak nobody owns.
A 30-day office trace shows the same CO₂ peak every Wednesday afternoon. Why it happens, what it costs, and the cheapest fix.
What 30 days of CO₂ in a Year 6 classroom told us about exam season
Pre-exam revision in a closed classroom reliably runs at 1,800 ppm CO₂. The performance drop is measurable, and so is the fix.
The tenant call you should never have to take
Mould complaints arrive long after the conditions that cause them. A continuous humidity trace catches the 14-day window where you can still act for free.
Calibration is not a feature. It is a process.
Every gas sensor drifts. The right question is not "is it calibrated" but "when was it last calibrated, and how do you know it is still right."
The £40 air monitor reads zero PM2.5 every morning. Here is why.
Cheap monitors read zero in clean rooms. They also read zero when something is genuinely wrong. The trap, in three places.
Why CO₂ is the single strongest signal of office productivity
Cognitive performance drops 15% at 945 ppm and 50% at 1,400 ppm. Here is the evidence, the mechanism and the fix.
Your kitchen is probably worse than a London roadside
Indoor PM2.5 from cooking routinely eclipses urban traffic. Why it matters and what to do about it.
Bedroom CO₂ is the cheapest sleep hack you are not doing
A closed bedroom reliably doubles CO₂ overnight. Here is how to fix it without spending anything.
What CO₂ levels mean indoors
A practical, numerical guide to interpreting indoor CO₂ readings — outdoor baselines, occupancy effects and what good and bad look like in homes, offices and classrooms.
How to read PM2.5 indoors
PM2.5 readings inside a home can swing from 5 to 500 µg/m³ in minutes during cooking. Here is how to interpret the values — and what to act on.
Humidity, mould and winter ventilation
Mould risk peaks in winter — when humidity stays high, surfaces stay cold and ventilation goes down. Here is what to watch in the data.
Why indoor air quality monitors need more than one sensor
Single-channel monitors give you a coloured light. Multi-channel monitors give you the diagnosis. Here is why the difference matters.
How to use air quality data with an air purifier
Air purifiers help — when they are needed. A continuous PM2.5 reading tells you when to turn them on, when to turn them off, and whether they actually work.
What to monitor in a classroom
A focused checklist of what every classroom should have continuous data on — and what to do when each channel goes amber.
What to monitor in a rental property
A focused checklist of what every rental property should have continuous data on — for mould prevention, dispute evidence and Awaab's Law compliance.
Be first when Envora One ships.
£249 one-time + VAT at checkout. Free for homes — no subscription, no paywall on safety alerts. Free UK and EU shipping. Apple Pay, Google Pay, Klarna and SEPA via Stripe.
Free UK & EU shipping · 2-year warranty · Reply within one UK business day.