No to both but I remember one morning a couple of years ago, the sky turning a peculiar golden-yellow colour for an hour or so.
It turned out to be very fine sand, not much coarser than talcum-powder, that an unusual wind pattern had carried all the way from the Sahara Desert, Northwards across Spain and France, to Southern England.
A lot of it settled to the ground, and my car gathered a very thin coat of the yellow dust.