How far to evacuate?

[TOF]

If I'm at home when any of these scenarios occur, my plan is to stay put. Chemical spill, safer indoors than risk possible exposure. Rioting, doubtful I'd be affected, I'm too far out of town.
If I'm out and about, stuff in my handbag will pretty much see me home if necessary. It would have to be something pretty major to make me leave my humble abode, only then would I go onward to a safer place.