I want to change the value of the exposure component of the hdri sky to 0 at runtime through code when the player gets below a certain Y-level. I can provide more details if needed, but any help would be appreciated!
You can modify volume components through script
there’s a doc page explaining how to do that
https://docs.unity3d.com/Packages/com.unity.render-pipelines.high-definition@16.0/manual/Volumes-API.html