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Originally Posted by sober

thanks , i am trying to get rid of my brown fog at dusk and
dawn . Mod combo or what , i dunno .

I suppose you have already played with hdr_exterior ColorBalance settings. Probably the brown fog at twilight is a side effect of your tweaks aimed to make it lesser green at noon

If you want a suggestion, I would try tweaking the SkyHazeColor settings in EnvColors cfg files