Adding a static fog in the bottom of a terrain

I did a little hack that doesn't work flawlessly and haunts me in my dreams, but hey, as long as others think it works, eh? I added this to my main camera's script.

     private float startY = 0;
     private float fogStart = 0;
     private float fogEnd = 0;
 
     void Awake()
     {
         startY = transform.position.y;
         fogStart = RenderSettings.fogStartDistance;
         fogEnd = RenderSettings.fogEndDistance;
     }
 
     void Update()
     {
         RenderSettings.fogStartDistance = fogStart + transform.position.y - startY;
         RenderSettings.fogEndDistance = fogEnd + transform.position.y - startY;
     }

I'm still thinking about other possibilities and any further ideas would be much welcome.