Exactly! First you notice its a bit dusty everywhere, then that places that are not regularly swept seem to accumulate dirt a lot faster than normal - ant then you put one and the huge volcano next door together and bam! :-D

Nice touch how the city runs ash collection points or how people living on Sakurajima itself (the volcano) cope with it. They have roofs over gravestones, transparent tents over fruit tree plantations & ash sweeping equipment on every bus stop. Oh and those flying rock shelters every ~600 meters. :)