Here is a (much cheaper ~50€) DIY project "airrohr" that measures particulates: https://sensor.community/en/sensors/airrohr/ https://sensor.community/en/sensors

Here is a (much cheaper ~50€) DIY project "airrohr" that measures particulates: https://sensor.community/en/sensors/airrohr/ https://sensor.community/en/sensors/airrohr/ The project was formerly known as luftdaten.info They are collecting data from more than 10,000 sensors world-wide!