Sulfur dioxide (SO2) card

Who it’s for

Environmental health officers, air quality managers, and industrial site managers ask “is SO₂ at this monitoring station currently within safe limits?” They track sulfur dioxide as a primary indicator of combustion and industrial emissions that directly affect respiratory health.

What it does

A sensor reporting sulfur = 65 µg/m³ displays the reading on a color-coded card: 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).

• Live SO₂ reading in µg/m³ with automatic color coding across five severity bands
• Severity bands align with WHO and EU air quality guidelines for sulfur dioxide
• Shows one sensor’s reading per widget; add multiple widgets to monitor different stations or zones

How to set up

Data keys

Key	Role	Type	Description
sulfur	Main value	Timeseries	Sulfur dioxide concentration in µg/m³; change the key name to match your device’s telemetry key

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 severity thresholds — edit Icon color ranges and Value color ranges; set the same boundaries in both so the icon and the number always agree.
• To change the band colors — edit the color of each range in Icon color ranges and Value color ranges.
• To rename the units label — change the Units field in the widget settings if your sensor reports in ppm.

Tips

• SO₂ spikes closely follow combustion source activity; a monitoring station downwind of an industrial facility will show sharp increases during production hours and a return to baseline overnight and on weekends.
• Elevated SO₂ in combination with high humidity accelerates the formation of sulfuric acid aerosols, which are more hazardous than SO₂ alone; pairing this card with a humidity widget on the same dashboard provides early warning.
• For regulatory reporting, archive hourly average readings rather than instantaneous values, as most national standards specify compliance in terms of 1-hour or 24-hour mean concentrations.