Sulfur dioxide (SO2) chart card

Who it’s for

Environmental health officers, air quality managers, and industrial site managers ask “what is the SO₂ level at this station right now, and has it been elevated over the past few hours?” They need both the current reading and the trend to determine whether an exceedance is a brief transient or a sustained episode requiring action.

What it does

A monitoring station streams sulfur telemetry and the widget shows the current value color-coded by severity alongside a time-series chart of recent readings: 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 lets operators see whether an elevated reading is a momentary spike or a prolonged episode.

• Live SO₂ reading in µg/m³ with color coding across five severity bands
• Historical trend chart shows how SO₂ concentration has evolved over the selected time window
• Shows one sensor’s data per widget; add multiple widgets to monitor different 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 chart colors — edit the color of each range on the Latest data key.

Tips

• A chart spanning 6–12 hours captures the full lifecycle of an industrial emission episode — the onset, peak, and dispersion — which is exactly what regulatory authorities need to assess duration and cumulative exposure.
• SO₂ levels at downwind stations typically lag the source by 15–60 minutes depending on wind speed; comparing charts from upwind and downwind stations on the same dashboard helps pinpoint the emission source during an incident.
• Export the time-series data with station GPS coordinates when submitting a regulatory exceedance report; most national frameworks require both the concentration values and the measurement location.