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Devices
Envora One Available Eleven channels · one fused IAQ score Envora Radon Coming soon Real-time radon · 0–2,000 Bq/m³
Capabilities
Features Alerts, history, dashboards Developers API · MQTT · Home Assistant Envora Fleet Multi-device · org · SSO · audit
All sensors
Overview of the eleven measurements
Carbon Dioxide ppm The breath signal. How fresh is the air you are in? Carbon Monoxide ppm Low-level exposure, tracked over time. Particulate Matter µg/m³ See what you breathe. Down to one micrometre. Temperature & Humidity °C · %RH Comfort is a range, not a number. Barometric Pressure hPa Weather, altitude, storms — all in one number. VOC & IAQ Index index Every gas. Every particle. One honest score. Sound Level dBA The ambient floor, measured — never recorded. Ambient Light lx Your circadian signal, measured.
For your space
All solutions
 Home Kitchens, bedrooms, nurseries, basements. Envora shows you what you breathe — and tells you how to fix it, usually for free. Office & 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. CO₂ 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. Labs & Clinics Envora One is precise enough for laboratories, clinics and regulated spaces, and comes with a signed calibration certificate per device ID. Studios & Gyms Hot yoga, spin, HIIT and small studios generate extreme humidity and CO₂ loads. Envora tells you how your ventilation is holding up — live, per-room, per-class. Podcasts & Studios Envora flags the HVAC hum, the fridge compressor, the neighbour's drill — and the concentration drift that flattens your delivery — before the tape picks any of it up. Landlords & Letting Continuous, timestamped indoor air quality records for every unit you manage — so damp disputes end in data, not arguments.
What it protects against
All protection guides
 Mould & damp risk Invisible until it is not. Allergies & dust sensitivity The 40–50% RH sweet spot. Long-term toxic gas exposure What you cannot smell, Envora can. Cooking pollution Your kitchen is an industrial chimney. Sleep & bedroom air Sleep is an environmental sport. Winter dry air Heated air is parched air. Outdoor air events When the air outside is worse than inside.
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Theme
Developers

MQTT air quality sensor

A native MQTT indoor air quality sensor — no community bridge, no vendor cloud round-trip, no rate limits for home users.

Developer overview
  • REST API · documented
  • MQTT native broker
  • Home Assistant first-class
  • Local-only mode
  • CSV export
  • Webhooks · signed

Why MQTT matters

MQTT is the standard for IoT messaging because it is lightweight, low-latency and decoupled — devices publish to topics, anything subscribing picks the data up. For an air quality sensor, this means Home Assistant, Node-RED, Telegraf, your own dashboards and your BMS can all consume the same readings without polling, without API limits and without vendor middleware.

A monitor that only offers cloud API access cannot do this cleanly. A monitor with a community MQTT bridge is fragile — it depends on someone maintaining the bridge against the vendor's cloud API. A native MQTT monitor just works.

Envora One MQTT topic structure

envora/{device_id}/co2 — CO₂ in ppm, integer
envora/{device_id}/pm25 — PM2.5 in µg/m³, float
envora/{device_id}/pm1, /pm10 — same units
envora/{device_id}/voc — VOC index
envora/{device_id}/co — CO in ppm
envora/{device_id}/temperature — °C, float
envora/{device_id}/humidity — %RH
envora/{device_id}/pressure — hPa
envora/{device_id}/lux — lux
envora/{device_id}/dba — dBA
envora/{device_id}/iaq — fused IAQ score 0–100

Home Assistant auto-discovery topics under homeassistant/sensor/envora_{device_id}_{channel}/config.

QoS 1 by default; retain flag on the latest reading per channel so reconnecting subscribers see current state immediately.

Setup

Three settings on the device: broker host, port, optional username/password. TLS supported (port 8883). Devices publish to your broker on the topic structure above and Home Assistant auto-discovery is enabled by default.

For local-only deployments, the device can also run its own embedded broker on port 1883 — useful if you do not have a broker already and want to keep everything offline.
A real MQTT air monitor

Envora One — £249. Native MQTT, Home Assistant auto-discovery, local-only mode included.

Developer docs
More for developers: Indoor air quality monitor API · Home Assistant CO₂, PM2.5 and VOC sensor
FAQ

FAQ — MQTT air quality sensor

Is the MQTT broker first-party?
Yes — Envora One publishes natively, no community bridge, no vendor cloud round-trip required.

Does it support TLS?
Yes — TLS on port 8883 with client certificate authentication if required.

Can multiple devices publish to the same broker?
Yes — devices are distinguished by `device_id` in the topic structure. A single broker can handle a multi-device deployment without configuration changes.

Does it work without an Envora cloud account?
Yes — local-only mode runs entirely against your broker. No internet round-trip required for MQTT operation.
Buy Envora One

A serious air monitor for developers.

API, MQTT, Home Assistant, local-only mode, CSV export. £249 one-time, no home subscription.

Buy Envora One — £249 Developer docs

Free UK & EU shipping · 2-year warranty · Reply within one UK business day.