Download Dynamic Volumetric Fog Free Unity. 

Complete realtime dynamic volumetric fog solution in unity3d.
Include three approach to render dynamic volumetric fog, from the modern AAA solution to the most compatible solution for low-level mobile platform.
1. Shadowmap ray-march based approach. Best visual quality that match AAA industry level, heavy performance impact for mobile platform.
2. Post process based volumetric fog, based on camera image effect. Good visual quality and lower performance impact.
3. Object based volumetric fog. It’s the traditional per-object fog. Great performance and should compatible with all kinds of platform.

Fog features include:
1. Volumetric visual fog.
2. Height and distance based fog.
4. Animated fog with customized noise.
5. Control fog speed, direction, color and density.