Simple sulfur dioxide (SO2) chart card

Who it’s for

Environmental health officers, air quality managers, and industrial site managers ask “how has SO₂ concentration at this station trended over the last few hours or days?” They want a compact trend chart that fits into a multi-station overview without the overhead of a full chart card.

What it does

A monitoring station streams sulfur telemetry and the widget renders a time-series chart of those readings, color-coded by severity: green for Good (0–100 µg/m³), light green for Moderate (100–200 µg/m³), orange for Elevated (200–350 µg/m³), dark orange for High (350–500 µg/m³), and red for Hazardous (above 500 µg/m³). The chart fills the card without a large numerical readout, maximizing the visible time window.

• Trend chart of SO₂ concentration over the selected dashboard time window
• Color-coded by severity at each point in time across five bands
• Shows one sensor’s data per widget; add multiple widgets to compare trends across stations

How to set up

Data keys

Key	Role	Type	Description
sulfur	Chart series	Timeseries	Sulfur dioxide concentration in µg/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 Sulfur 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 (µg/m³)	Level	Color
0–100	Good	Green
100–200	Moderate	Light Green
200–350	Elevated	Orange
350–500	High	Dark Orange
500+	Hazardous	Red

How to customize

• To change the time window — adjust the dashboard time filter to show the last hour, day, or week of SO₂ readings.
• To change the severity thresholds — edit the color ranges on the Latest data key.
• To change the chart colors — edit the color of each range on the Latest data key.

Tips

• Use this chart in a grid alongside simple chart cards for NO₂, CO, and O₃ to give operators a side-by-side multi-pollutant trend view without cluttering the dashboard with large value cards.
• SO₂ follows a diurnal pattern tied to industrial activity — rising during production hours and falling overnight; a 24-hour time window makes deviations from this baseline immediately obvious.
• SO₂ levels that remain elevated overnight or over a weekend often indicate a background regional source rather than a local industrial process, which requires escalation to national environmental authorities.