Lluvia sucia.

The sky has been a strange grey/orange colour for a few days, and it's felt  very hot like being covered in an airless blanket. A couple of thunderstorms and this is the result: "dirty rain" over everything. This is the view through the windscreen while queuing for the car wash. It happens every year and is the result of fine Saharan sand being whipped up and suspended in the clouds until released by the precipitation.
The ghostly image bottom right is the obligatory mask, this one an FFP2, sitting on the dashboard ready for use.