Iray Dust is a collection of shader overlays, decals, and an atmospheric effect that replicates large dust particles in the air. The shader overlays are applicable to most UV'd models and will not destroy the texture underneath. Different strength values and colors allow you to tweak your overlay effect. If your model is UV'd strangely, or has no UV's at all, you can use the integrated Iray decal node.

The Atmospheric effect is a simple drag and drop grid that works in most lighting scenarios. Simply add it to your scene and hit render.

Bring out the gritty details with Iray Dust.