dcs weather, there is a Lua file, which has a fog script file, but add the value, the entire map is fog, which the Supreme can write a LUA file, want to put a fog at a particular airport, not Know how to write such a document,:lol: 
fog =  
    { 
        thickness = 0, 
        visibility = 25, 
        density = 7, 
    }, -- end of fog 
    visibility =  
    { 
        distance = 80000, 
    }, -- end of visibility