Product Name: GP2Y1010AU0F dust sensor module

https://www.instructables.com/id/How-to-Interface-With-Optical-Dust-Sensor/

Too cheap to be useful? https://techblog.calvinboey.com/review-of-the-sharp-dust-sensor-gp2y1010au0f/

Technical parameters

Power supply voltage: DC5 � 2V

Operating Current: 20mA (peak)

Sensitivity: 0.5V / (0.1mg / m3)

The minimum detection level of particles: 0.8 m

Clean air voltage: 0.9V typ.

Working temperature: -10 ~ 65

Storage temperature: -20 ~ 80

Size: 46mm � 30mm � 17.6mm

Size Weight: 15g

arduino

https://github.com/mickey9801/GP2Y1010AU0F

  calcVoltage = voMeasured * (this->_VCC / 1024.0);
  // linear equation taken from http://www.howmuchsnow.com/arduino/airquality/
  dustDensity = (0.17 * calcVoltage - 0.1) * 1000.0;

Source code here works much better if you do 10 readings and average them before sending result

tasmota

https://github.com/arendst/Tasmota/pull/7118