Find the right guide.

Terrestream measures CO₂ only - it does not measure CO. Use UL-listed CO alarms.

CO vs CO₂: we measure one, not the other

Carbon monoxide and carbon dioxide sound alike and the abbreviations look alike. They are completely different gases. Terrestream measures CO₂ only.

Attached garages: the highest-risk source in most homes

A running engine ten feet from your living space. Cold-start emissions are the worst. Door seals matter more than you think.

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.

Lead paint and renovation dust: a metal hazard we cannot see

Homes built before 1978 (US) and before 1992 (Canada) are likely to contain lead paint. Renovating without containment releases lead-laden dust that no air-quality sensor can identify.

Asbestos in older homes: a fiber hazard outside our envelope

Asbestos was used in insulation, popcorn ceilings, vinyl flooring, and roofing through the 1980s. Disturbing it releases microscopic fibers we cannot detect; mesothelioma latency is decades.

Terrestream advises on your air, not your health

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.

Terrestream is not a smoke alarm. Every home needs UL 217 smoke alarms.

Smoke detector vs IAQ monitor: not the same instrument

A common confusion: the sensor on your wall reads PM2.5, and smoke is PM2.5, so it must be a smoke alarm too. It is not. The two devices answer different questions on different timescales, with different consequences for being wrong.