FS2004 BlueSphere Service Pack. The reduced visibility layer was missing in seasons other than summer, therefore this service packj. At the same time this will make things easier to install clouds, lowvis or trees separately and comes in different sizes for fps reasons. Some files of less importance added for those who want reality also at seldom visited places. And some additional info on how this reduced visibility works within FS and my considerations about the modification. By Gerrit Kranenbarg.