Simple carbon monoxide (CO) chart card with background

Who it’s for

Environmental health officers, air quality managers, and smart city operators ask “how has CO trended recently?” The simple chart with background combines compact trend visualization with full-card color coding so the current status is visible at a distance.

What it does

A monitoring station streams carbon telemetry and the widget renders a time-series trend chart on a card whose background color reflects the current severity: green for Good (0–5 mg/m³), light green for Moderate (5–10 mg/m³), orange for Elevated (10–25 mg/m³), dark orange for High (25–50 mg/m³), and red for Hazardous (above 50 mg/m³).

• Full-card background color communicates current severity at a glance from a distance
• Trend chart of CO concentration over the selected dashboard time window
• Shows one sensor’s data per widget; add multiple widgets to compare trends and current status across stations

How to set up

Data keys

Key	Role	Type	Description
carbon	Chart series	Timeseries	Carbon monoxide concentration in mg/m³; change the key name to match your device’s telemetry key
Latest	Latest value	Timeseries	The headline figure above the chart. Its own color ranges are where the band colors are edited

The widget ships with a simulated function datasource key labeled Carbon monoxide, 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
0–5	Good	Green
5–10	Moderate	Light Green
10–25	Elevated	Orange
25–50	High	Dark Orange
50+	Hazardous	Red

How to customize

• To change the time window — adjust the dashboard time filter to show the last hour, day, or week of CO readings.
• To change the severity thresholds — edit the color ranges on the Latest data key.
• To change the background colors — edit the color of each range on the Latest data key.

Tips

• On a wall display, the colored background signals the current severity from across the room while the embedded chart gives the trend context when someone approaches the screen.
• Use consistent severity colors across all air quality widgets so operators can interpret a red background anywhere on the dashboard without reading the label.
• A sustained upward trend over several days usually indicates gradual equipment degradation or a new emission source; a spike-and-return pattern typically indicates a transient event.