Smoke and fire: why we are not a smoke alarm
The particle sensor sees smoke once it fills a room. A UL 217 smoke alarm sees it in seconds and screams loud enough to wake a sleeping family. They are not substitutes.
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Radon: an alpha-particle hazard we cannot detect
Radon is the second-leading cause of lung cancer in the US after smoking. It cannot be detected by any optical, NDIR, or MOX sensor; only alpha-particle counters can see it.
What Terrestream does not measure
Terrestream measures a specific set of air-quality parameters. There are many hazards it does not measure at all - here is a non-exhaustive list of common ones, and the dedicated detector or test to use instead.
The AI is an environmental advisor, not a medical one
The dashboard will tell you about your air. It will not diagnose, prescribe, or speculate about your health. The line between those two is bright and intentional.
Breathe Better. Live Smarter.
Turn air-quality knowledge into action.
One sensor. Twelve signals. Indoor readings connected to outdoor context and plain-English recommendations. Everything you just read can be measured live in your own home.
$249 USD one-time
Buy Terrestream Explore the sensor- No subscription required
- 30-day returns
- 1-year limited warranty
- Fast shipping via FedEx
Six sensors. Twelve signals.
Built on genuine Sensirion, Bosch, and Texas Instruments sensors.
- COâ‚‚
- IAQ
- VOC
- NOâ‚“
- PM1
- PM2.5
- PM4
- PM10
- Temperature
- Humidity
- Pressure
- Light
Included
- In the box: the sensor, USB-C cable, power adapter, and printed field guide
- Dashboard and mobile app included
- Privacy-first air data
Works with
- Home Assistant
- MQTT
Home Assistant
MQTT