Climate change is here for all of us. As an ex Iowan (now west coaster) who has dealt with fires now for a few years, the obvious limit exposure out side, stay in air conditioning if you can, and even with air conditioning, a taped furnace filter to a box fan can do a lot to filter out ash.
If you're having ashfalls, try to keep cars covered, the ash can oxidize the paint, and if you do get ash on it make sure to wash it soon. Don't wipe ash off as it's coarse and will scratch your paint.