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

Product Name: GP2Y1010AU0F dust sensor module

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