Accessing PM2.5 Particle Counts via AirGradient API ?

Getaneh · November 17, 2025, 4:02pm

The AirGradient API documentation mentions “pm003Count” (the number of particles with a diameter above 0.3 microns in 1 deciliter of air). Is there a similar field for “PM2.5” particle counts? If so, how can it be accessed via the API?

MallocArray · November 17, 2025, 7:53pm

Not sure if the public API is the same as the local one, but from;

github.com

airgradienthq/arduino/blob/master/docs/local-server.md

## Local Server API

From [firmware version 3.0.10](firmwares) onwards, the AirGradient ONE and Open Air monitors have below API available.

### Discovery

The monitors run a mDNS discovery. So within the same network, the monitor can be accessed through:

http://airgradient_{{serialnumber}}.local


The following requests are possible:

### Get Current Air Quality (GET)

With the path "/measures/current" you can get the current air quality data.

http://airgradient_ecda3b1eaaaf.local/measures/current

“ecda3b1eaaaf” being the serial number of your monitor.

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it shows

pm003Count	Number	Particle count 0.3um per dL
pm005Count	Number	Particle count 0.5um per dL
pm01Count	Number	Particle count 1.0um per dL
pm02Count	Number	Particle count 2.5um per dL
pm50Count	Number	Particle count 5.0um per dL (only for indoor monitor)
pm10Count	Number	Particle count 10um per dL (only for indoor monitor)