"Martin Rowley" wrote in message...
Looks like it will remain a mystery (and can't be a 'desert-origin'
dust/rain event); very striking on the vehicles I saw - the fact that you
(Bernard) have had reports for yesterday (22nd) may point to something
very local, but if it is, then it affected a large area of south and SW
Bracknell.

Martin.

Martin

No indication here of dust:

http://forecast.uoa.gr/dustindx.html

Tree pollen?

Karl Cooper, Orkney