Horizontal radon level card

Who it’s for

Building managers, property owners, and occupational health officers ask “what is the radon level in this zone right now?” They need a compact, space-efficient card that fits into multi-zone dashboards without dominating the layout.

What it does

A sensor reporting radon = 45 Bq/m³ displays the reading in a horizontal card whose label and value sit side by side, color-coded by risk band: green for Safe (0–100 Bq/m³), orange for Elevated (100–200 Bq/m³), and red for High (above 200 Bq/m³).

• Horizontal layout fits more sensors per row on a building management dashboard
• Live radon reading in Bq/m³ with automatic color coding across three severity bands
• Shows one sensor’s reading per widget; tile multiple widgets to monitor all zones and floors at a glance

How to set up

Data keys

Key	Role	Type	Description
radon	Main value	Timeseries	Radon concentration in Bq/m³; change the key name to match your device’s telemetry key

The widget ships with a simulated function datasource key labeled Radon level, so it draws random values until you point the datasource at a device and rename the key.

To point it at your own device: open the dashboard in edit mode, open the widget’s Datasources, pick the entity or entity alias, and replace the function key with the key your device reports.

Value ranges

Range (Bq/m³)	Level	Color
0–100	Safe	Green
100–200	Elevated	Orange
200+	High	Red

How to customize

• To change the severity thresholds — edit Icon color ranges and Value color ranges; set the same boundaries in both so the icon and the number always agree.
• To change the band colors — edit the color of each range in Icon color ranges and Value color ranges.
• To rename the units label — change the Units field in the widget settings if your sensor reports in pCi/L.

Tips

• Use the horizontal layout to fit more zones per row when building a whole-building radon overview dashboard; pair with the standard card for critical zones where a larger display is warranted.
• Radon concentrations are highest in basements and ground-floor rooms with poor ventilation; install sensors at floor level in these spaces for the most representative readings.
• For occupational health compliance, archive daily average readings alongside sensor location metadata so inspectors can confirm measurements were taken in occupied zones at the correct height.