Compare indoor air-quality monitors

Last reviewed June 10, 2026. Indoor-air monitors are not interchangeable. Some are strong single-purpose instruments, some emphasize smart-home convenience, and some are built for commercial deployments. This overview uses public manufacturer or support pages where available and avoids claiming that every model has the same current pricing or subscription behavior.

Sensor coverage differs first. Ruuvi Air and Terrestream both use Sensirion SEN66 for CO₂, PM₁/PM_2.5/PM₄/PM₁₀, VOC Index, NO_x Index, temperature, and humidity. Awair Element support describes temperature, relative humidity, CO₂, total VOCs, and PM_2.5. Airthings View Plus lists radon, PM_2.5, CO₂, VOCs, temperature, humidity, and pressure. Aranet4 HOME focuses on CO₂, temperature, humidity, and pressure. IQAir AirVisual Pro lists AQI, PM_2.5, CO₂, temperature, and relative humidity.

Terrestream is built around breadth plus interpretation. The device stack covers CO₂, IAQ, PM₁/PM_2.5/PM₄/PM₁₀, VOC index, NO_x index, temperature, humidity, pressure, and light. The product difference is not only the raw list of channels; it is the way the app and dashboard connect indoor readings with outdoor air, weather, history, and source explanations.

Use-case distinctions. Aranet4 is a portable CO₂-focused monitor. Airthings View Plus includes radon. IQAir AirVisual Pro emphasizes a large color display and PM_2.5/CO₂ dashboard. Kaiterra Sensedge Mini is positioned for modular commercial deployments. Terrestream combines broader home sensing with multi-signal indoor air interpretation.

Keep comparison pages dated. Competitor specs, integrations, warranties, and subscriptions change. Treat the references below as the source trail and contact support if a specific purchase decision depends on one current claim.