Nitrogen dioxide (NO2) card with background

Who it’s for

Environmental health officers, traffic managers, and smart city operators ask “can I read the NO₂ severity across the whole monitoring network at a glance, even from across the room?” The background-color variant is designed for wall-mounted dashboards where a single colored card must communicate severity without anyone needing to read the number.

What it does

A monitoring station reporting nitrogen = 28 µg/m³ displays the reading on a card whose entire background fills with the severity color: green for Good (0–40 µg/m³), light green for Moderate (40–90 µg/m³), orange for Elevated (90–120 µg/m³), dark orange for High (120–230 µg/m³), and red for Hazardous (above 230 µg/m³).

• Full-card background color makes severity readable across a room without reading the number
• Live NO₂ reading in µg/m³
• Shows one sensor’s reading per widget; tile multiple widgets to cover an entire monitoring network at a glance

How to set up

Data keys

Key	Role	Type	Description
nitrogen	Main value	Timeseries	Nitrogen dioxide concentration in µg/m³; change the key name to match your device’s telemetry key

The widget ships with a simulated function datasource key labeled Nitrogen dioxide, 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	Level	Color
0–40	Good	Green
40–90	Moderate	Light Green
90–120	Elevated	Orange
120–230	High	Dark Orange
230+	Hazardous	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 ppb.

Tips

• On a wall display showing multiple NO₂ cards, the background color lets operators spot a single elevated station instantly without scanning individual numbers.
• Use consistent severity colors across all air quality widgets on the same dashboard.
• For compliance reporting, pair this card with a NO₂ chart card so inspectors see both the current reading and the daily trend without switching views.