PM2.5 card with background

Who it’s for

Air quality engineers, city planners, and environmental health officers ask “how high is the fine particle concentration right now?” They use these cards on dedicated air quality monitoring displays or public information screens where a background image gives the card a polished look.

What it does

A sensor reading 28 µg/m³ shows an orange icon and value — Moderate — over the preset background image. The same card shows green at 6 µg/m³ — Good — and red at 90 µg/m³ — Hazardous.

• Color-coded icon and value that shift across four PM2.5 bands from Good to Hazardous
• Decorative background image bundled with the widget, with a white overlay that keeps the text readable
• Last-updated timestamp showing how long ago the reading arrived
• Shows one sensor’s data; it does not chart trends or compare multiple monitoring sites

How to set up

Data keys

Key	Role	Type	Description
pm2.5	Main value	Timeseries	PM2.5 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 PM2.5, 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.

The card shows the value in µg/m³ with no decimal places. If the key has never reported, the card displays the label and icon with an empty value, not an error.

Value ranges

Range	Level	Color
0–10	Good	Green
10–35	Moderate	Orange
35–75	High	Dark Orange
75+	Hazardous	Red

How to customize

• To swap the background image — open the widget settings and set Background to a different image or switch to a solid color.
• To adjust how much the background shows through — change the Overlay opacity; lower values reveal more of the image, higher values push it further back.
• To use your own PM2.5 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 icon — set Icon to any Material or MDI icon name.
• To hide the label, icon, or timestamp — turn off Show label, Show icon, or Show date.
• To match your dashboard’s fonts — set Value font and Label font.

Tips

• Keep Icon color ranges and Value color ranges on the same boundaries so the icon and the number always show the same band.
• If the background image reduces contrast, raise the Overlay opacity to keep the text readable from a distance.