Here is a quick tutorial along with some examples on how to enable Volumetric Fog with the Exponential Height Fog while using Path Tracer.

1) Enable Infinent Extent Bounds on your Post Process Volume
2) Enable "Reference Atmosphere" on your Post Process Volume
3) Enable "Volumetric Fog" on your Exponential Height Fog
4) Zero the World Coordinates of your Exponential Height Fog
5) Increase your Fog density, Switch to Path Tracer and Enjoy!

0:00 Intro
0:16 Create Project / Enable Ray tracing
0:33 Add Fog / Volumetric Fog
1:25 Create Post Process Volume
1:48 Set Path Trace Settings in PPV
2:07 Zero Position of Exponential Height Fog
3:14 Fog Sample 1
4:02 Fog Sample 2
4:27 Fog Sample 3
5:11 Wrap Up

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