As we are talking about Jellystone popping it's lid, I have a few thoughts as to being ready/preparing for the couple of weeks of SHTF. I remember when Mt St Helens blew and what that was like.
I don't have all the correct terms and I'm sure some of my ideas are flawed but this would be a good chance to correct them.
Rain catch systems would have to be sealed off due to the ash and toxicity of any rain that fell. What filter would clean out the acid in the water?
What would you do with your garden? Again, any water would leach acid into the ground and either kill your plants or poison the edibles.
What can you do to keep your livestock and pets safe with all the ash in the air? I remember we couldn't go outside for two days after St Helens and then for a week it was with a dust mask on.
Running generators and any other motor was a sure fired way to ruin it within an hour or so due to the ash scoring the cylinder walls.
In closing- We talk about water, food, and other kinds of SHTF, but what are you doing about an air quality issue?