Particulate matter sensors measure the amount of very small particles in the air. A short introduction how these sensors work can be found on Open Home Automation.
Cheap LED based sensors usually use a GPIO interface that is hard to attach to computers. However, there are a lot of laser LED based sensors on the market that use a serial interface and can be connected to your Home Assistant system easily with an USB to serial converter.
At this time, the following sensors are supported:
To use your PM sensor in your installation, add the following to your
sensor: - platform: serial_pm serial_device: /dev/tty.SLAB_USBtoUART brand: oneair,s3
sensor: - platform: serial_pm serial_device: /dev/tty.SLAB_USBtoUART name: Nova brand: novafitness,sds011