Going to bore you all now by saying it's a mixture of Sahara dust particles and the Portuguese fires - both transported north quickly due to Hurricane Ophelia.
It's very black here currently in Crawley - looks like rain to the South West heading this way.
Tree Surgeons across the road from us are going give up on the Day. They basically can't see what they are doing - not what you want if you are dangling from a tree with a Chainsaw...
BBC Weather website is proudly keeping up the Michael Fish Tradition, apparently it should be bright sunshine until early evening in RH20!