This mod reduced a little the level of fog.
2 Different parametrs for route col_de_turini_rally_01 and col_de_turini_rally_02
1. First make sure to back up your files, you'll overwrite.
2. Extract .rar file and replace/overwrite the existing files to [X]:\steam\steamapps\common\DiRT Rally
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Fog in Monte Carlo 1.0
Reduction the level of fog