Simple ozone (O3) chart card with background

Who it’s for

Environmental health officers, air quality managers, and smart city operators ask “how has ozone trended recently?” The simple chart with background combines compact trend visualization with full-card color coding so the current status is visible at a distance.

What it does

A monitoring station streams ozone telemetry and the widget renders a time-series trend chart on a card whose background color reflects the current severity: green for Good (0–50 µg/m³), light green for Moderate (50–100 µg/m³), orange for Elevated (100–130 µg/m³), dark orange for High (130–240 µg/m³), and red for Hazardous (above 240 µg/m³).

• Full-card background color communicates current severity at a glance from a distance
• Trend chart of ozone 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
ozone	Chart series	Timeseries	Ozone 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 Ozone, 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
0–50	Good	Green
50–100	Moderate	Light Green
100–130	Elevated	Orange
130–240	High	Dark Orange
240+	Hazardous	Red

How to customize

• To change the time window — adjust the dashboard time filter to show the last hour, day, or week of O₃ 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 the afternoon ozone build-up is still in progress.
• Use consistent severity colors across all air quality widgets so operators can interpret a red background anywhere on the dashboard without reading the label.
• Ozone levels that remain elevated into the evening rather than declining after sunset indicate an unusual meteorological event that typically warrants a public advisory.