Simple PM2.5 chart card

Who it’s for

Air quality engineers, city planners, and environmental health officers ask “how has PM2.5 changed over time, without the clutter of delta comparisons?” They want to see the current concentration and a trend line in one card, nothing more.

What it does

A sensor currently reading 28 µg/m³ shows an orange value — Moderate — above a chart that reveals whether fine particle levels have been rising toward hazardous conditions or clearing back toward Good over the selected period.

• Large current PM2.5 value color-coded across four bands from Good to Hazardous
• Time-series chart of PM2.5 readings over the selected time window, averaged per interval
• Shows one sensor’s data; it does not compare multiple monitoring sites or show period-over-period deltas

How to set up

Data keys

Key	Role	Type	Description
pm2.5	Chart series	Timeseries	PM2.5 concentration in µg/m³; drives the chart. The Latest value overlay is automatically derived from this same 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 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.

If the key has never reported for the selected time window, the chart is empty and the value overlay shows no data.

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 use your own PM2.5 thresholds — edit the color ranges on the Latest data key; adjust the four default bands to match your regulatory limits.
• To hide or show the chart — toggle Show chart in the widget settings.
• To change the chart line color — set Chart color.
• To show min, max, or total in the legend instead of avg — edit the Legend settings.
• To hide the entity name subtitle or the timestamp — turn off Show subtitle or Show date.
• To match your dashboard’s fonts — set the font options under each data key’s appearance settings.

Tips

• Use this card when the trend shape matters more than the exact period-over-period change. Add the full PM2.5 chart card if you need a delta percentage alongside the chart.
• A gradual overnight climb that peaks at dawn — then falls once traffic disperses — is a classic inversion signature; a sudden mid-afternoon spike more likely points to a nearby industrial or wildfire source.