Aranet Radon One

A radon test kit is a passive device (typically a charcoal canister or alpha track strip) that you place in your home for a set period, then mail to a laboratory for analysis. You receive a single average number days or weeks later. A continuous radon monitor like Aranet Radon One measures radon levels in real time, 24 hours a day, and displays results on the device itself. Because radon levels fluctuate daily and seasonally, continuous monitoring provides a much more complete picture of your home's actual exposure than a one-time test result.

Aranet Radon One uses an ionization chamber sensor that detects alpha particles released during the radioactive decay of radon gas. The device counts decay events over time and calculates radon concentration in Bq/m3. It provides a first reading in approximately 10 minutes, a reliable 1-hour average, and progressively more accurate averages over 24 hours, 7 days, and 30 days. Long-term averages are accurate to ±10%.

The World Health Organization recommends a reference level of 100 Bq/m³ (2.7 pCi/L) for homes. Many countries set national action levels between 100 and 300 Bq/m³ (2.7–8.1 pCi/L). If your long-term average radon reading consistently exceeds your country's reference level, professional radon mitigation is recommended. Aranet Radon One displays color-coded indicators (green, yellow, red) that you can align with WHO or national reference levels through the Aranet Home app.

Place the radon monitor on the lowest regularly occupied floor of your home, typically a basement or ground-floor living area. Position it at least 50 cm (20 inches) above the floor, away from exterior walls, windows, doors, and areas with high airflow. Avoid kitchens, bathrooms, and laundry rooms. Radon enters from the ground, so lower floors generally have higher concentrations.

Aranet Radon One runs on two standard AA alkaline batteries and is designed to operate for up to 7 years under typical conditions. This is made possible by the E-Ink display, which draws power only during screen refreshes, and proprietary energy management technology (patent-pending). Batteries are included in the box. No power outlet, charging cable, or USB connection is needed.

No. Aranet Radon One operates independently without Wi-Fi. The device measures, calculates, and displays radon levels entirely on its own. The Aranet Home app connects via Bluetooth to retrieve stored data, view trend charts, and configure alert thresholds. Bluetooth syncing requires the app to be within range, but the monitor itself does not depend on any network connection to function.

The green, yellow, and red bars indicate radon concentration levels relative to configurable thresholds. Default thresholds are set following WHO radon guidelines. You can adjust these thresholds through the Aranet Home app to match your national reference levels. Green indicates levels within the recommended range. Yellow indicates levels approaching the action threshold. Red indicates levels that exceed the reference level and warrant further investigation or mitigation.

Radon levels fluctuate from hour to hour and season to season. A minimum monitoring period of several weeks is recommended before drawing conclusions. Longer monitoring periods (3 months or more, ideally across both heating and non-heating seasons) produce a more reliable long-term average. If readings consistently exceed your national reference level over an extended period, contact a licensed radon mitigation professional.

Yes. Aranet Radon One is battery powered and fully portable. You can move it to different rooms to compare radon levels across your home. Keep in mind that each time you relocate the device, it needs time to establish a new baseline in the new location. Allow at least 24 hours in the new position before interpreting results. The Aranet Home app stores historical data from all locations.

A properly performed short-term test provides a valid snapshot for the testing period. However, radon levels can vary significantly from day to day and across seasons. A continuous radon monitor measures these fluctuations over time and produces long-term averages that are more representative of your actual annual exposure. Health agencies including WHO recommend long-term measurements for the most reliable assessment of residential radon risk.