Last year here on the Costa Blanca we had what is known as Red Rain. Basically the winds from North Africa whip up a sand storm and carry the sand high in the atmosphere. If you are unlucky which in our region we were it pissed down with rain. The result is just a bloody mess. As you can imagine a lot of the villas are painted white, they jus look as if they are covered in Rust streaks, worse still is if your swimming pool has no cover it is a bastard to clean. I had to dump 6.5 tonne of water before it was fit for swimming in again. Consider this though that most villas have there own pool that is an aweful lot of water being pumped to waste. Spain being a dry country an all that.
Another effect is that the sand is that fine the roads become skating rinks ever after they dry out, the grains of sand just sit in the tarmac surface meaning a reduced amount of grip. I nearly came a cropper when I lost the front end on my FZ6. I was lucky as I picked her up and thankfully nothing was coming the other way, squeaky bum time that was.