I actually got that "sand effect" in the editor the other day. Like the wind was kicking up sand around the ground. The only problem is that I didn't really think about how I did it. I just thought it was the environment effects module. But now when I actually want it to appear I can't. This is really annoying. I've tried different months, times, weather etc. Any ideas?
Atleast I think I did... I have no memory of a vehicle close that was kicking up dust...
---EDIT---
Okay, I lied in the text above. Because I couldn't have been testing so many different times on the day to try kicking this sand effect in. My guess is that's it's there all the time when "Environment - Effects" module is on, but it's not that visible when it's too bright. 17:50 June the 28th, good weather, both environment effects and color module is present, and it's visible. Not that much though.