The amazing sunset last night and the hazy conditions that accompanied it turned out to be the forecast Saharan dust. Dust storms in the desert coupled with strong southerly winds carry the dust into the upper atmosphere and to us. The small dribbly attempts at rain have brought it down.
I had seen recently that Saharan dust supplies phosphorus to the Amazon. It also provides iron for the Mediterranean Sea when the wind is blowing as it is at the moment.
