Sulfur dioxide (SO2) chart card with background

Who it’s for

Environmental health officers, air quality managers, and industrial site managers ask “how has SO₂ trended at this station recently?” The chart with background combines compact trend visualization with a full-card color signal so status is visible at a distance.

What it does

A monitoring station streams sulfur telemetry and the widget renders a time-series trend chart on a card whose background color reflects the current 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).

• Full-card background color communicates current severity at a glance from a distance
• Trend chart of SO₂ 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
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
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 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 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 shows whether an afternoon emission episode is still in progress or already dispersing.
• Use consistent severity colors across all air quality widgets so operators can interpret a red background anywhere on the dashboard without reading the label.
• SO₂ levels that remain elevated overnight — when industrial activity typically falls — indicate background pollution from a regional source rather than a local point emitter, which requires a different regulatory response.