Best smart radon monitors with Home Assistant
Find the best smart radon monitors that integrate with Home Assistant and local-first smart home systems.
Last updated: 2026-05-23
Radon is a colorless, odorless, and tasteless radioactive gas that can pose serious health risks if present in high concentrations indoors. For homeowners in areas with known radon issues, monitoring radon levels is essential. While traditional radon detectors are available, smart radon monitors offer real-time data, integration with smart home systems, and actionable insights. If you’re building a local-first smart home with Home Assistant at its core, the right radon monitor can be a valuable addition to your system.
Choosing the Right Smart Radon Monitor
When selecting a smart radon monitor, consider factors like accuracy, integration capabilities, and ease of use. For a local-first setup, you want a device that communicates directly with your Home Assistant instance or a local hub, avoiding reliance on cloud services. Some monitors offer local data storage and local processing, which is ideal for privacy and performance.
A few monitors also support multiple protocols like Zigbee, Z-Wave, or Wi-Fi, which can be integrated with Home Assistant via the appropriate integration or hub. For users who prefer a more centralized approach, a smart hub like the Home Assistant Green or Hubitat Elevation C8 can act as a bridge between your radon monitor and Home Assistant.
Top Smart Radon Monitors for Home Assistant
AirGradient One
The AirGradient One is a popular choice for those looking for a smart radon monitor that integrates well with Home Assistant. It measures radon, PM2.5, CO2, and VOCs, providing a comprehensive air quality overview. While it doesn’t support direct integration with Home Assistant out of the box, it can be connected via MQTT or HTTP, making it a good fit for local-first setups. It’s also compatible with HomeKit and Hubitat, giving users flexibility in their smart home ecosystem.
AirGradient Open Air
The AirGradient Open Air is a more affordable option that focuses on radon and PM2.5. It’s ideal for users who want to track radon levels without the extra data points of the One model. It supports MQTT and can be integrated into a local Home Assistant instance with minimal configuration. For those who prefer a more hands-on approach, the Open Air is a solid choice.
Apollo MSR-2
The Apollo MSR-2 is a dedicated radon monitor that offers accurate readings and local data storage. It supports Z-Wave, making it compatible with Home Assistant through the Z-Wave integration. The MSR-2 is a good option for those who want a simple, reliable device that integrates cleanly with their existing smart home infrastructure. It’s also compatible with HomeKit and Hubitat, providing flexibility for users who want to expand their system.
Apollo R-Pro-1
The Apollo R-Pro-1 is a more advanced option that includes radon, humidity, and temperature monitoring. It supports both Z-Wave and Wi-Fi, making it compatible with Home Assistant through multiple integration methods. The R-Pro-1 is ideal for users who want a comprehensive air quality monitor that integrates well with their local smart home setup. It’s also compatible with HomeKit and Hubitat, offering additional flexibility.
Integrating Radon Monitors with Home Assistant
Integrating a radon monitor with Home Assistant can be done in a few ways depending on the device. For devices that support Z-Wave or Zigbee, you can use the built-in integrations in Home Assistant. For example, the Apollo MSR-2 can be integrated via Z-Wave, while the AirGradient One can be connected via MQTT or HTTP.
For devices that don’t support direct integration, you can use a local MQTT broker like Mosquitto to relay data from the monitor to Home Assistant. This approach ensures that your data remains local and secure, which is a key consideration for a local-first smart home.
If you’re using a smart hub like the Home Assistant Green or Hubitat Elevation C8, you can connect your radon monitor to the hub and then integrate the hub with Home Assistant. This method provides a centralized point of control and simplifies the integration process.
Quick Verdict
If you’re looking for a smart radon monitor that integrates well with Home Assistant and supports a local-first approach, the AirGradient One and Apollo MSR-2 are excellent choices. They offer accurate readings, local integration, and compatibility with multiple smart home platforms. For those who prefer a more comprehensive air quality monitor, the Apollo R-Pro-1 is a solid option. Always consider your specific needs and integration preferences when selecting a radon monitor for your smart home.