Breathe Better. Live Smarter.®

Product Safety Program

Effective September 27, 2026 · Version 2.0 · Reference page. The Terms of Service control.

This page describes how we tell people what the Terrestream Indoor Air Quality Sensor is and isn't. It covers the acknowledgment you give when you set up a sensor, how our notifications and outdoor forecasts are worded, and the labels on the box and the device. Terms §4.7 refers to this page. If this page and the Terms differ, the Terms control.

This page is about product safety messages. Security vulnerabilities are handled separately, under our disclosure program at terrestream.com/security (Terms §16).

1. What the sensor is and isn't

  • The sensor measures indoor air: carbon dioxide (COâ‚‚), particles, a VOC index, an NOx index, temperature, humidity, air pressure and light.
  • It is not a life-safety device. It doesn't detect smoke, fire, carbon monoxide (CO), radon or gas leaks. It doesn't replace smoke alarms or CO alarms, and it can't call for help.
  • Carbon dioxide (COâ‚‚) and carbon monoxide (CO) are different gases. A normal COâ‚‚ reading tells you nothing about carbon monoxide. This sensor doesn't detect carbon monoxide — keep your CO alarms.
  • The sensor runs on USB-C power and has no battery. If it loses power, it stops measuring. If it loses Wi-Fi, it can still show readings on its screen, but cloud updates and notifications may stop or be delayed without warning.
  • Readings, scores and suggestions are for information. They aren't medical advice.

Terms §4 sets out these limits in full.

2. The safety acknowledgment at setup

2.1 What you see

In supporting versions of the Terrestream apps and web dashboard, sensor setup presents a screen titled "Before you set up your sensor". It lists five points:

  1. Terrestream is not a life-safety device and does not replace smoke or carbon monoxide alarms.
  2. It measures carbon dioxide (COâ‚‚), not carbon monoxide (CO).
  3. Keep the smoke and CO alarms your home and local codes require, and test them.
  4. In an emergency, call 911 or your local emergency number.
  5. Readings, scores and suggestions are informational only.

You confirm by tapping "I understand". The screen is available in English, French and Spanish.

2.2 When it's required

Supporting versions of the apps and web dashboard show this acknowledgment before sensor setup. Its availability and enforcement depend on the client version and the active setup flow. When requested, you acknowledge each version once; if the text changes, a later setup may request the new version.

2.3 What we record

We keep a record that you acknowledged: the version, the date and time, and whether you used the iPhone app, the Android app or the web dashboard. The record is kept with your account's other consent records, as the Privacy Policy describes.

3. How notifications and screens are worded

Our apps, web dashboard, emails and notifications give information and suggestions. Where a message touches on safety, it carries a qualifier.

3.1 Suggestions, not instructions

Suggestions come from your readings, the outdoor forecast and rules we wrote. They use words like "Consider…" or "You may want to…". You decide what to do (Terms §5.3).

When there's nothing to point out, the apps and web dashboard say "Nothing to flag". This means our rules found nothing to point out in the readings we have. It doesn't mean the air is free of anything the sensor can't measure.

3.2 Outdoor forecasts

Some messages are about the outdoors near your home: wildfire smoke, particles, ozone, nitrogen dioxide, sulfur dioxide, carbon monoxide, wind, rain, snow and freezing rain. These come from third-party forecasts, not from your sensor. We label them as an "outdoor forecast".

Forecast suggestions are worded as options, for example "Consider keeping windows closed…".

When one of these messages names carbon monoxide, it adds: "This sensor doesn't detect CO — keep your CO alarms."

The forecast providers are listed at /legal/sub-processors.

3.3 Notifications that carry a qualifier

Notification What it includes
Wildfire smoke nearby The outdoor source of the smoke information (for example, NOAA satellite smoke analysis or NASA fire detections) and the words "Not a smoke alarm."
Heat and cold A qualifier such as "Informational only."
Gas-sensor changes (for example, NOx) A qualifier such as "Informational only — not a gas or CO detector."
Outdoor forecasts that name carbon monoxide "This sensor doesn't detect CO — keep your CO alarms."

Notifications can be delayed or not delivered, for example when your phone, the sensor or our service is offline (Terms §4.4).

3.4 Official alerts

For homes in the United States, the web dashboard shows active National Weather Service alerts for the home's area. We show each alert's own title and headline and name the office that issued it. Instructions from your local authorities take priority over anything Terrestream shows.

3.5 The sensor's screen and sounds

The sensor's screen shows readings with colored bands. The sensor can also play a chime when some readings (COâ‚‚, the air-quality index or particles) move into a higher band. These are information, not alarms. You can change the volume and set quiet hours in the Terrestream app for iPhone or Android.

When you first start the sensor, its screen asks you to accept the Terms of Service and Privacy Policy and provides access to the legal documents at terrestream.com/legal.

3.6 Terrestream Facilities

Terrestream Facilities sends monitoring alerts to an organization's responders by email. SMS delivery is currently disabled. These alerts are informational. They aren't a fire alarm, a freeze-protection system or an emergency service, and they can be delayed or not delivered. The Facilities workspace shows a missing or out-of-date reading as missing; it doesn't treat it as normal. Terms §7.2 and the Commercial Addendum cover Facilities alerts in full.

3.7 On-screen reminders

Supporting screens and notification formats include informational safety reminders. Availability varies by client version and message type; do not rely on a persistent on-screen warning to know the limits in section 1.

4. Labels on the box, printed guide and sensor

Read the labels and instructions supplied with your particular sensor. This page does not verify the markings or printed wording on an individual unit. Contact support if a label or guide is missing or unclear. See the Regulatory Disclosures for the scope of the radio information provided.

5. Changes to this program

We update this page when these messages change. The acknowledgment in section 2 has its own version number. When we change it, we publish the new text here and ask for it at the next setup. If a change materially affects how we communicate safety limits, we give notice as Terms §20.5 describes.

6. Version history

  • September 27, 2026 · 2.0. Rewritten to describe what exists: one safety acknowledgment at setup, the wording of notifications and outdoor forecasts, and guidance on checking the labels supplied with a unit. Removed descriptions of screens and features that don't exist.
  • June 1, 2026 · 1.0. Initial publication.

Earlier versions are kept at /legal/archive.

7. Related documents

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