Toxic air but it works on OWA, every faction that spawns in toxic areas will start with a basic gas mask, surplus helmet can now use filters (just a QoL) and i reduced the weight and cost of the oxygen tanks and filters. original creators of the mod are credited. I tested this while having mcm and modded exes on, so if it doesnt work make sure you have those. To install, simply drag and drop the gamedata into the directory or use Mo2
billions must patch for old world
Update
Zombified stalkers have filters in their starter loadout, and ofc a basic gas mask so they can use them