Hi,
the pollution particles causing the restriction in visibility.
The volcanic ashes in big concentration can also cause a visibility restriction.
It's not really the problem actually.
The problem with the volcanic ashes (or volcanic particles) is that they act in a particular way when they are ingested in the jet engines ..
By a physical process (cause heat) they will not only make damages but they will also melt and stick on parts of the engine (turbine blades etc )
However, I can sit here in Scotland on a beautiful fresh Sunday morning with clear blue skies and unlimited visibiility
So continue to enjoy your beautiful blue sky from the ground .. it's the best place to be actually
