Airkit Air quality sensor, intelligent air monitoring product can monitor the air PM2.5 concentration (Buspro)
https://b2b.hdl-automation.cz/en/support/products/data-sheets/buspro/Sensorss/hdl-masla-2c(sb-cms-la)
https://b2b.hdl-automation.cz/en/support/products/data-sheets/buspro/Sensorss/hdl-masla-2c(sb-cms-la)