https://blendermarket.com/products/dustify

Dust is everywhere, so let’s fully embrace it and use it to add realism to our scenes. This .blend file contains the Dustify geometry node seupt and Dustify material node with which you can turn any object into its dirty / dusty version. It’s made to work incredibly well up-close so go nuts with the details. Both the geometry node setup and material node come with a wide variety of customization options so you can tweak the dust to your own personal preferences.