How do I make a fog wall

Hi, i downloaded the unity pro trial for my project and I need to use the global fog image effect as part of it. I want to make a dense fog wall around my player space to disguise it from being unfinished/the end of the map instead of being everywhere.

Here is my player space.

And this is what I want, done in photoshop…

Any help would be grand. Thanks.

I figured it out by using a simple particle system!

First make a new particle. Make its shape a ‘Box’, a really long box, so make the x-axis however long you want. And use these settings:

It’ll look like this:

Hope this helps! This was the effect I was going for too. Also using it as a barrier in my game. Feel free to tweak the settings.