Carbon monoxide (CO) chart card

Who it’s for

Environmental health officers, air quality managers, and smart city operators ask “what is the CO level at this station right now, and has it been rising or falling over the last few hours?” They need both the current reading and the recent trend on a single card to distinguish a genuine escalation from normal daily fluctuation.

What it does

A monitoring station reporting carbon = 3.2 mg/m³ shows the current value color-coded by severity alongside a time-series chart of recent readings: 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). The chart lets operators see whether an elevated reading is a new spike or a persisting problem.

• Live CO reading in mg/m³ with color coding across five severity bands
• Historical trend chart shows how CO concentration has evolved over the selected time window
• Shows one sensor’s data per widget; add multiple widgets to track and compare stations across a network

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
Delta percent	Percentage change	Timeseries	Change against the previous period, as a percentage
Delta absolute	Absolute change	Timeseries	Change against the previous period, in the key’s own unit

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 match your local regulatory limits.
• To change the band colors — edit the color for each severity level in the widget settings.

Tips

• A sudden spike on the chart that returns to baseline within minutes typically indicates a transient source like a vehicle idling near the sensor; a sustained rise over hours points to a persistent emission source worth investigating.
• Set the time window to 24 hours to capture the typical daily CO cycle driven by morning and evening traffic peaks, making anomalies easy to spot.
• For compliance reporting, use the chart’s export feature to download the raw time-series data for the period under review.