Horizontal nitrogen dioxide (NO2) card

Who it’s for

Environmental health officers, traffic managers, and smart city operators ask “can I compare NO₂ across several stations without losing the severity colors?” The horizontal layout is designed for dashboards where vertical space is limited and multiple readings must share a narrow column.

What it does

A monitoring station reporting nitrogen = 28 µg/m³ displays the color-coded reading in a wide, low-height card: 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). The horizontal format lets you stack many sensors in a narrow sidebar without scrolling.

• Live NO₂ reading in µg/m³ with color coding across five severity bands
• Compact horizontal layout fits more sensors in a narrow column than a square card
• Shows one sensor’s reading per widget; stack multiple widgets to display a full station network in a single sidebar

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

• Stack horizontal NO₂ cards in a sidebar next to a traffic or city map so operators can see which roadside stations are elevated while keeping the geographic view in view.
• Arrange cards in the same order as the stations appear along a road corridor so operators can spot progression of an emission plume without reading station labels.
• 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.